In a stand mixer using the paddle attachment, mix the warm water, sugar, and yeast. Let it sit for about 5-10 minutes until it becomes frothy.
Add olive oil to the yeast mixture.
Add salt to the mixture.
Add 1 cup of spelt flour and vital wheat gluten and mix until combined.
Switch to the dough hook and add the remaining spelt until smooth and elastic.
Using a bowl scraper or well-oiled hands, scrape the dough to make it come together, cover it with a damp cloth, and let it rise in a warm area for about 1 hour, or until doubled in size.
Preheat your oven to 375°F (190°C). If you're using a cookie sheet, line it with parchment paper. if you're using a hamburger pan, grease the pan. Divide the risen dough into 6-8 equal portions. Shape each portion into a ball and place them on the baking sheet, leaving enough space between each for expansion. Cover with a damp cloth and let them rise for another 20-30 minutes, or until nearly doubled in size.
Optional, but before you put the buns in the oven, brush the tops of the buns lightly with the beaten egg. If you'd like, sprinkle sesame seeds on top.
Bake for 15-20 minutes, or until the buns are golden brown and sound hollow when tapped on the bottom.
Cool on a wire rack before slicing and using for hamburgers.