To achieve the perfect fluffy custard buns, it’s essential to pay attention to the dough preparation and rising times. Start with fresh ingredients, especially the dry yeast, as aged yeast can diminish the rise. When mixing the dough, knead it until smooth and elastic to develop gluten, which contributes to the fluffiness of the buns. Allow the dough to rise in a warm environment—this may require placing it near a warm oven or under a clean kitchen towel. The first rise should double the size of your dough, which typically takes 1 to 1.5 hours. The second rise after shaping the buns is equally important; letting them puff up for 30-40 minutes helps maintain that desirable airy texture when baked. Lastly, closely monitor the baking process to avoid over-baking, as this can lead to dry buns.