Preheat the oven to 350 degrees and line a plate with a double layer of paper towels.
In a small fry pan, heat a small amount of vegetable oil over medium heat. Fry each tortilla for a few seconds on each side to soften them. Remove to the plate to drain off any excess oil. This makes the tortillas easier to roll and prevents them from breaking. Add additional oil as needed to soften the remaining tortillas.
Pour some of the sauce into the bottom of a 9x12-inch baking dish.
In the center of each tortilla, add some filling and top with a little jack cheese. Tightly roll each enchilada and place in the baking dish seam side down.
Cover the enchiladas with the remaining sauce and sprinkle with the remaining cheese.
Bake for 20 to 25 minutes or until cheese just starts to brown. Don't bake too long, or your sauce will dry up.
Serve enchiladas topped with cilantro, red onion and radish slices.
Makes 12 to 15 enchiladas.