1
Heat oil in a large skillet over medium-high heat. Add onions; cook until softened, about 5 minutes. Add garlic, jalapeno, chili powder, cumin, and coriander; cook, stirring, 1 minute.
2
Add beef; cook, breaking up meat with a wooden spoon, until no longer pink, about 5 minutes. Stir in tomatoes; cook, stirring occasionally, until liquid has evaporated, 15 to 20 minutes. Season generously with salt.
1
Heat Taco Filling in a saucepan over low heat (or in the microwave). Warm tortillas in a dry skillet over medium heat (or directly over a gas burner), about 30 seconds per side.
2
To assemble, spoon taco filling onto tortillas, and top with lettuce, radishes, cheese, cilantro, and salsa. Fold to enclose.
3
Serve sour cream on the side. Garnish with diced jalapeno, if desired.