Jack cheese by John Spottiswood.

This California semi-soft cheese resembles Muenster. It has a mild, nondescript flavor, but it's good cheese to slice into sandwiches or melt into casseroles. It also goes by California jack, Monterey jack, Sonoma jack, and Mexican jack, depending on where it was produced. Efforts to boost the flavor have produced Pepper Jack = Jalapeno Jack. Don't confuse this with aged jack, which is a grating cheese.