1 cup water lukewarm
2 tbls unsalted butter, at room temperature and creamed
3 1/4 cups plain white flour
1/4 cup castor sugar (I just use regular granulated sugar)
1 tsp salt
1 tbls instant yeast
1 egg yolk (+ 1 tsp water)
Sprinkle the yeast into the water and leave for 5 minutes. Stir to dissolve.
Combine all remaining dough ingredients and mix well.
Turn the dough out on to a lightly floured working surface and knead for about 10 minutes until you've made a soft, smooth dough.
Place the dough in a clean and lightly greased bowl.
Cover it with a towel and let rise for about 1 or 1 1/2 hours, until doubled in size.
Divide the dough into 8 pieces and shape each piece into a flattened ball.
Place the buns on greased baking sheets, cover with a towel and let rise 30 to 40 minutes, until they're quite puffy and doubled in size.
Preheat the oven to 375°F (190°C).
Glaze the buns with the egg yolk and water mixture, then sprinkle with sesame seeds.
Bake the buns for 12 to 15 minutes, until they are golden brown.
Remove them from the oven and cool them on a wire rack.
Source: Amber's Delectable Delights, http://amberskitchen.blogspot.com/