Here is the REAL Casa Ole version:

5 lb – American Cheese, grated
3 cups – water
1/4 cup – water (divided from 3 cups)
1 1/2 cup – chopped onion (see note)
1 cup – chopped celery (see note)
1 cup – chopped green onion (see note)
1/4 cup – finely chopped jalapeño (see note)

Combine cheese and three cups water in the top of a double boiler and bring to a boil. Stir every 5 minutes.

While cheese is melting, combine onion, celery, bell pepper and jalapeño in saucepan and add 1/4 cup water. Sauté over medium heat until vegetables come to a light boil. When cheese has melted and is smooth, add vegetables and mix thoroughly. Simmer 5 minutes. This makes a large amount; recipe could be cut in half or thirds.

NOTE: Amounts are approximate. The file recipe calls for 13 ounces chopped onion, 9 ounces chopped celery, 10 ounces chopped bell pepper and 1 & 3/4 ounces chopped jalapeños.