Each serving of this steamed Japanese custard pudding delivers 31 grams of protein from a combination of whole eggs, egg whites, and vanilla protein powder dissolved into warm milk. The total calorie count stays at 320 per serving, with only 9 grams of fat — nearly all of it from the egg yolks, which contribute choline and fat-soluble vitamins alongside their protein. Six eggs in total, three whole and three whites, give the custard its traditional richness without the excess fat that cream-based Western custards carry.

Purin is Japan's answer to crème caramel: a trembling, barely-set custard inverted over a pool of dark caramel. The flavor is quieter than its French cousin — less cream, more egg, with vanilla that sits behind the custard rather than in front of it. The bittersweet caramel, made by cooking sugar just past golden to a deep amber, provides the only sharp note, and that contrast between gentle custard and dark caramel is what makes every cold spoonful worth eating slowly.

The soft, smooth texture of steamed custard is one of the gentlest foods for a stomach adjusting to GLP-1 medication. Each pudding is satisfying without being heavy, and the combination of 31 grams of protein with a moderate amount of natural sugar helps prevent the blood sugar dip that can follow a carb-heavy dessert. Purin is served cold, which many GLP-1 users find more appealing than warm desserts when appetite is reduced.

Why This Works on GLP-1

With 31 grams of protein per serving, this pudding does real nutritional work for a dessert. Muscle preservation is one of the biggest concerns during GLP-1-assisted weight loss — research consistently shows that higher protein intake helps protect lean mass when the body is in a caloric deficit. A dessert that contributes meaningfully to your daily protein target, rather than spending your limited appetite on empty calories, is especially valuable for anyone on Mounjaro or a similar GLP-1 medication.

The custard's smooth texture requires almost no mechanical digestion, which matters when GLP-1 medications are slowing gastric emptying. Unlike fiber-heavy desserts that can sit uncomfortably, egg custard moves through gently. The small amount of lactose from low-fat milk is well tolerated by most people, and the recipe works with lactose-free milk without any change in texture.

The fat content is modest at 9 grams per serving, nearly all from egg yolks. Those yolks also deliver vitamins A, D, E, and K along with choline — a nutrient many adults on calorie-restricted diets fall short on. At 320 calories, the pudding leaves room in a typical GLP-1 meal plan for this to be a genuine dessert rather than something you have to skip a meal to justify.

Ingredients (serves )

For the caramel:

  • 2 tbsp (25g) granulated sugar
  • 1 tbsp (15ml) water
  • 1 tbsp (15ml) hot water (to stop the cooking)

For the custard:

  • 3 large eggs
  • 3 large egg whites
  • 1 scoop (30g) vanilla whey protein powder
  • 1 cup (240ml) low-fat milk
  • 1 tbsp (12g) granulated sugar
  • 1 tsp vanilla extract
  • Pinch of fine sea salt

Instructions

Make the caramel:

  1. Combine 2 tablespoons sugar and 1 tablespoon water in a small saucepan over medium heat. Swirl the pan gently but do not stir — stirring causes crystallization that turns the caramel grainy. Cook until the sugar melts and turns a deep amber, about 3–4 minutes.
  2. Remove from heat immediately and carefully add 1 tablespoon hot water to stop the cooking. The mixture will bubble aggressively. Swirl to combine, then divide the caramel evenly between two heatproof ramekins or cups (6–8 oz / 180–240ml each). Tilt each ramekin to coat the bottom and set aside to harden while you prepare the custard.

Make the custard:

  1. Warm the milk in a small saucepan or microwave until warm to the touch — not hot, not simmering. Whisk the protein powder into the warm milk until completely dissolved, about 30 seconds. Dissolving it into the milk first prevents clumps that would break the custard's smooth texture.
  2. In a medium bowl, whisk together the whole eggs, egg whites, sugar, vanilla extract, and salt. Whisk steadily but gently — you want everything combined without creating foam. Bubbles on the surface become pockmarks in the finished custard.
  3. Pour the warm milk mixture into the egg mixture in a thin stream, whisking constantly. Strain the combined custard through a fine-mesh sieve into a measuring cup or spouted bowl. Straining removes the chalazae and any undissolved protein powder, and it is the single step that separates silky purin from ordinary baked custard.

Steam the custard:

  1. Pour the strained custard into the two caramel-lined ramekins. Cover each ramekin tightly with aluminum foil to prevent condensation from dripping onto the surface.
  2. Place a folded kitchen towel or silicone trivet on the bottom of a pot large enough to hold both ramekins. Set the ramekins on the towel, then pour hot water into the pot until it reaches halfway up the sides of the ramekins. The towel prevents the ramekins from rattling and insulates the bottom from direct heat.
  3. Cover the pot with a lid, leaving it slightly ajar by resting a wooden chopstick or spoon handle between the lid and the rim. This vents excess steam and keeps the temperature below a full boil — if the water boils hard, trapped steam creates air pockets throughout the custard that ruin the texture.
  4. Bring the water to a gentle simmer over medium-low heat and steam for 15–18 minutes. The custard is done when the edges are set but the center still jiggles like gelatin when you tap the ramekin. It will firm up fully as it cools.
  5. Carefully remove the ramekins from the pot and let them cool to room temperature, about 30 minutes. Refrigerate for at least 2 hours, or overnight for the best flavor and texture.

Unmold and serve:

  1. Run a thin knife around the edge of each ramekin. Place a small plate upside down over the ramekin, then flip both together in one confident motion. Lift the ramekin away — the caramel will pool around the custard as a glossy sauce.

Nutrition per Serving

Nutrient Amount (approx.)
Calories ~320 kcal
Protein ~31g
Fat ~9g
Carbohydrates ~27g
Fiber ~0g

Based on large eggs, 1% low-fat milk, and a standard 30g scoop of vanilla whey protein isolate providing 24g protein per scoop.

Practical Notes

Make it the night before. Purin tastes best after a full night in the refrigerator — the caramel softens into a proper liquid sauce and the custard reaches its firmest, silkiest texture. Spend 35 minutes of active time in the evening and tomorrow's dessert is already waiting in the fridge.

Take the caramel darker than you think. Cook the sugar past golden to a genuine dark amber. Lighter caramel tastes like nothing once it sits under the custard and chills for hours; darker caramel provides the bittersweet contrast that defines purin. If it smells acrid and smoky, you have gone too far — discard it and start again with fresh sugar.

Substitute the protein powder carefully. Unflavored collagen peptides dissolve even more seamlessly than whey and will not alter the custard's texture at all, though collagen has a different amino acid profile. Plant-based protein powders tend to be grainier — test with a small batch first. Skipping protein powder entirely drops each serving to about 20g protein; compensate by adding two more egg whites.

If you are in the first weeks of GLP-1 treatment, halve a serving. One ramekin splits easily between two small bowls, and 15g of protein from half a serving is still more than most conventional desserts offer. Eat slowly and stop when satisfied — the custard keeps covered in the refrigerator for up to three days.

Any heatproof vessel works. Traditional Japanese purin molds, ceramic ramekins, glass custard cups, or heatproof ceramic mugs are all fine. Wider, shallower cups steam faster — check at 12 minutes. Tall, narrow ones need a few minutes longer. Each vessel should hold at least 6 oz (180ml).

Frequently Asked Questions

Can I make this without protein powder and still get enough protein?
Without the protein powder, each serving provides about 20 grams of protein from the eggs and milk alone. That is still substantial for a dessert but falls short of the 25g threshold. To compensate, add two extra egg whites to the custard base, which brings the total to roughly 24g per serving without changing the texture noticeably. Another option is to pair the purin with a small side of plain Greek yogurt, which adds 10–15g protein and complements the custard's vanilla flavor.
Can I use a sugar substitute for the custard portion?
The tablespoon of sugar in the custard itself can be replaced with an equal amount of a granular erythritol-monk fruit blend without affecting the set or the texture. The caramel, however, requires real sugar — sugar substitutes do not caramelize and will not produce the sauce. Two tablespoons of sugar split between two servings adds about 12 grams of carbohydrates per serving from the caramel, which is modest for a dessert. If you want to reduce further, use slightly less caramel rather than trying to substitute it.
How long does purin keep, and can I double the batch?
Covered and refrigerated, purin keeps for up to 3 days. The caramel gradually thins into a more liquid sauce over time, which is normal and preferred by many cooks. To double the batch, simply scale all ingredients and use four ramekins — make sure they all fit in your steaming pot without touching, so steam circulates evenly. Cover each one individually with foil. A large pot with a steamer rack works well for four to six puddings at once, making this a practical make-ahead dessert for the week.
What if my appetite is very small on GLP-1 medication?
Each ramekin splits easily into two smaller portions. Half a serving still provides about 15 grams of protein at only 160 calories — more nutritional value than most conventional desserts. You can unmold the whole pudding, cut it in half with a wet knife, and refrigerate the second portion covered for the next day. If you regularly find that half is the right amount, consider dividing the custard among three or four smaller cups (3–4 oz each) before steaming, and adjust the steaming time down by about 3–4 minutes.
Why does my custard have bubbles or a pockmarked surface?
Three things cause this. First, whisking too vigorously incorporates air — stir with a gentle folding motion and keep the whisk submerged. Second, skipping the straining step leaves tiny air pockets trapped around bits of egg membrane and undissolved protein. Third, and most commonly, the steaming temperature was too high. If the water reaches a rolling boil, the custard itself boils internally and trapped steam creates holes. Keep the lid cracked with a chopstick and maintain a bare simmer — you should see only a few lazy bubbles in the water, not a vigorous roll.

This article provides general food and nutrition guidance only. It does not constitute medical advice. Always consult your healthcare provider regarding your GLP-1 medication and individual nutritional needs.