Heat the oven to 200° C (390° F)

Melt the butter in the microwave or water bath

Give the butter, baking powder, baking soda, salt and sugar in a large bowl and mix well using a fork

Now add half of the water and stir again

Add the flour and mix again. The consistency should be rather crumbly

Add the rest of the water and knead well with your hands until you have a smooth non sticky dough. If it's not smooth adjust water or flour accordingly

Give the dough to the fridge for 10 minutes and let cool

Now divide the dough in 4 parts, knead again and form little buns of approx. 1 cm height - let sit on a lined baking rack for another 10 minutes

Now grease with butter and garnish with sesame seed

Bake for approx. 15 minutes or until firmed up

Let cool completely. Shortly before serving cut the bun into halves and toast in a toaster