Havent made these in awhile, I think my Aunt gave me the recipe but to be honest I am not sure. but saw a post on Looking For... and went searching for them ...yummy! i love onion and these are delish! They are soft not hard rolls.
In a small bowl, combine yeast, sugar and 1/2 cup warm water. Let rest 5 minutes until foamy.
Meanwhile, In large mixing bowl or stand mixer, combine shortening, salt, 3/4 cup sugar and 1/2 cup margarine. Pour in boiling water and stir until blended and cooled slightly.
In yet another bowl, mix eggs, yeast mixture and cold water. Add flour alternately with liquid ingredients to first bowl containing the shortening-sugar mixture. Mix well. Dough will be sticky. Cover with plastic wrap and refrigerate 5 hours or overnight.
Heat onion in microwave for 1 to 1 1/2 minutes or until limp. Drain and cool. Punch down dough and divide into 6 equal parts.
Keeping other pieces of dough, covered, on lightly floured surface, roll 1 piece of dough into a rectangle 18-by-7 inches. Brush with melted margarine and sprinkle on 1/6 of the onions. Sprinkle with 1/2 teaspoon salt and 1/4 teaspoon poppyseeds. Roll jellyroll fashion. Cut into slices 1 3/4-inch wide. Place rolls seam side down on parchment-lined baking pan, spacing 2 inches apart, or in greased muffin tins. Cover with greased plastic wrap and let rise until doubled. Repeat with remaining dough.
Heat oven to 350 degrees. Brush rolls with 1 large egg yolk beaten with 1 tablespoon water. Sprinkle on a little salt and poppyseed. Bake 12-15 minutes or until golden. Cool completely. You can freeze whatever rolls you will not be using.