Indulge in Singapore's beloved Rottiboy Mexican Bun, a buttery, coffee-scented delight that’s as irresistible as it is unique. These fluffy buns feature a soft, pillowy dough filled with a hidden core of melty, frozen butter that oozes with every bite. Topped with a signature crisp coffee-infused shell, these baked treats boast a perfect balance of sweetness, richness, and aromatic charm. Crafted using simple pantry staples like all-purpose flour, instant yeast, and coffee granules, this recipe guides you through creating bakery-quality buns at home in just a few steps. Perfect for breakfast, tea time, or an afternoon indulgence, these buns are a show-stopping treat that will awaken your senses and impress any guest. Bake these golden delights today and bring a little taste of Singapore to your kitchen!
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In a large bowl, combine the flour, instant dry yeast, sugar, and salt for the dough.
Add warm milk to the dry ingredients and mix until a shaggy dough forms.
Add softened butter to the dough and knead for 8–10 minutes until a smooth and elastic dough forms. You can do this by hand or with a stand mixer equipped with a dough hook.
Place the dough in a lightly greased bowl, cover it with a damp cloth, and let it rise in a warm place for 1 hour or until it doubles in size.
While the dough is rising, prepare the frozen butter cubes for the filling by cutting the butter into 8 equal-sized cubes and placing them back in the freezer.
For the topping, cream the softened butter and powdered sugar together until light and fluffy.
Add the egg to the butter-sugar mixture and mix well.
Dissolve the coffee granules in warm water, then add this mixture to the topping batter.
Gradually fold in the flour and mix until a smooth paste is formed. Transfer the paste to a piping bag fitted with a round tip and set it aside.
After the dough has risen, punch it down to release the air and divide it into 8 equal parts. Shape each piece into a ball.
Flatten each dough ball, place a cube of frozen butter in the center, and seal the butter tightly inside by pinching the edges of the dough together. Reshape into a ball.
Place the filled dough balls on a baking tray lined with parchment paper, ensuring sufficient spacing between each bun. Cover loosely with a damp cloth and let them proof for another 30–40 minutes until they puff up.
Preheat your oven to 180°C (356°F).
Once the buns have proofed, pipe the coffee topping in a spiral pattern over each bun, starting from the center and working your way outward.
Bake the buns in the preheated oven for 12–15 minutes, or until the topping turns golden brown and crisp.
Remove the buns from the oven and allow them to cool slightly on a wire rack before enjoying.
Serving size | (862.8g) |
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Amount per serving | % Daily Value* |
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Calories | 3250.1 |
Total Fat 150.2g | 0% |
Saturated Fat 91.9g | 0% |
Cholesterol 568.7mg | 0% |
Sodium 1319.8mg | 0% |
Total Carbohydrate 423.0g | 0% |
Dietary Fiber 11.2g | 0% |
Total Sugars 137.2g | |
Protein 51.1g | 0% |
Vitamin D 197.4IU | 0% |
Calcium 270.6mg | 0% |
Iron 15.1mg | 0% |
Potassium 783.6mg | 0% |
Source of Calories