Naan-e Barbari Ingredients

For 6 flat breads:

4 cups (500g) flour
2/3 oz (20g) fresh yeast
stick (50g) soft butter
7 fluid ounces (200ml) milk
1 egg yolk
1 tablespoon sesame seeds
1 tablespoon nigella seeds
1 teaspoon salt
a little cream
butter
water