I haven't had it in years. but Swiss cheese is a classic. You shred the cheese and mix just a little bit of flour with the shreds. IIRC, you wipe the inside of the fondue pop with a fresh-cut garlic clove, add the cheese and melt it, and thin with white wine and a little Kirsch. I'm probably leaving something out. And maybe the wine goes in first.
really close
1/2 pound imported Swiss cheese, shredded
1/2 pound Gruyere cheese, shredded
2 tablespoons cornstarch
1 garlic clove, peeled
1 cup dry white wine
1 tablespoon lemon juice
1 tablespoon cherry brandy, such as kirsch
1/2 teaspoon dry mustard
Pinch nutmeg