Buns with ground flaxseed

INGREDIENTS 350g MIX B flour (by Schar + 30g to flour the surface) 100g ground flaxseed 40g tapioca 60g melted butter 1 egg 1 teaspoon salt 350ml warm water 1 packet active dry yeast   COATING: 1 egg yolk INSTRUCTIONS In a big bowl, put warm water, dry yeast, a teaspoon of sugar and a…