From Scratch: Spelt & Graham Flour Hamburger Buns

Name: From Scratch: Spelt & Graham Flour Hamburger Buns
Cuisine: American
Ingredients: 250ml (1 cup) milk; 50g (3½ oz) butter; 1 egg (medium); 1 tbsp maple syrup; 300g (2½ cups) white spelt flour (see note 1); 150g (1 cup + 2tbsp) graham flour (see note 2); 7g (2¼ tsp) yeast (see note 3); 2 tsp sea salt; 1 tbsp milk (to "wash" the dough); sesame seeds