Firm jelly; for centers Use 1 level t. soda dissolved in 2 T. hot water. Flour to make a very stiff dough. Roll, cut and dip in egg white, then in granulated sugar. Put firm jelly in center or each cookie. Watch closely as they will burn easily. Note: Combine all ingredients except egg whites. Use additional granulated sugar for dipping. No temperature given, but probably 190ºC .