Homemade sesame Buns

1/2 c warm water
1/2 tsp. sugar
1 package fast acting dry yeast
1/2 C warm milk
2T butter, melted and cooled
2 1/2- 2 3/4 C bread flour, divided
1 tsp. salt
1 egg white, lightly beaten
2T sesame seeds
Place, water, sugar and yeast in large bowl of stand mixer with paddle attachment. Let stand 2-3 minutes or until yeast is dissolved. Add milk, butter and 1 C bread flour;beat at low slow speed until combined. slowly add enough of the remaining flour to form a soft dough. Knead for 10 minutes. Place in greased medium bowl; cover with plastic wrap and towel. Let rise for 30 minutes or until doubled.Gently punch down dough to deflate;place on a lightly floured surface. divide into 6 pieces. Form each piece into a ball; place on a parchment lined baking sheet. cover with towel and let stand 3 minutes. Flatten into rounds, cover with towel, let rise 15 minutes. Place another lightweight baking sheet on top of towel covered buns. Let buns rise for 25 minutes or until almost doubled in size. Meanwhile heat oven to 375 degrees F Lightly brush top of buns with egg white and sprinkle with sesame seeds. Bake 20 minutes or until golden brown. Cool completely on a wire rack.