1 Stir in flour a little at a time until smooth, then remove from heat. 2  Add broth and milk a little at a time, stirring to keep mixture smooth. 3  Then, stir in mushrooms. 4  Return to heat and bring sauce to a gentle boil; stir constantly until sauce thickens.
A pound is equal to 16 ounces. If 20 slices equals 1 pound equals 16 ounces, then 1 slice is equal to 16 oz / 20 = .8 ounces. 1 pound = 16 oz = 20 slices. 16/20 oz per slice.
= 80 ounces or 80 serving sizes. A portion size, however, is â¦ how much is served per person per meal, or course. Generally speaking 1 portion is between 2 and 4 ounces of cheese, depending on the meal, or 2-4 serving sizes per portion. Thus 5 pounds of cheese should serve 20-40 meals, or portions.