Entered for safe-keeping, from "Modernist Cuisine at Home". Although sodium citrate sounds gross, it is an emulsifying salt that allows you to make ANY cheese into slices that melt as perfectly as American-style sandwich cheese does (and how do you think the processed cheeses get that way, eh?). Of course, it is available through Amazon.com or the Modernist Pantry. If you omit the sodium citrate, the cheese will separate when it melts. These slices are for cheeseburgers, grilled cheese sandwiches, vegetables, apple pie, or any other dish needing a melted cheese that doesn't separate. The preparation time includes refrigeration setting time. The slices will keep 10 days when refrigerated or up to 2 months when frozen.