From https://modernistcuisine.com/2013/08/grilled-cheese-sandwiches-to-knock-your-socks-off/
I keep a big jar of the stuff in my pantry because it is so useful for making cheese sauces for pasta, nachos or fondue. Just dissolve 11 grams of sodium citrate into 1 1/8 cups (265 milliliters) of milk or water over medium heat, bring to a simmer, and gradually whisk or blend in 285 grams of finely grated cheese (3 to 4 cups, depending on the kind of cheese and coarseness of the grater). As the cheese melts, the sodium citrate serves as an emulsifier and prevents the fat from splitting off to form a greasy slick on top.
11 g sodium citrate
265 ml fluid
285 g finely grated cheese
bring sodium citrate and fluid to a simmer; whisk in cheese being mindful of not breaking the emulsion.
The recipes below riff on this technique to make a thicker cheese sauce that sets into an even sheet, perfect for cutting into slices and adding to sandwiches. Use whatever kind or blend of cheeses and liquids you want (cold wheat beer works well in place of water). Add the weights of the cheese and liquid, and multiply the total by 0.028 to get the amount of sodium citrate to use.
For example, you can make 500 grams of emulsified cheese (enough for 12 to 14 slices) by blending 14 grams of sodium citrate into 115 milliliters of cold wheat beer, simmering, and blending in 200 grams (3 cups) of grated Gruyere and 180 grams (3 cups) of grated sharp cheddar.
Poured into a warm baking sheet and covered with plastic wrap, the cheese becomes solid after about two hours in the refrigerator. The slices, when individually wrapped in plastic or parchment paper, will keep for up to two months in the freezer. They thaw quickly, so when you get that Sunday afternoon urge for a quick grilled cheese blast from the past, you can recreate a fond memory from childhood in no time.
Seawater is 3% salinity
Emulation is two tablespoons per quart of water
For boiled green beans two quarts salt water boiling cook for seven minutes