In a big bowl mix all ingredients together except semi-hard rolls and let stand overnight in refrigerator
Next day cut the rolls in half on one side smear a little amount of butter and put on spread
Close the roll with the other half and mount in aluminum foil
Heat oven to 350F and bake for 15 to 20 minutes If you do not use up all the rolls at once the rest mounted in aluminum foil can be stored in refrigerator for 2 days