Ingredients

1 (12-16 oz) pork tenderloin
1 Tbs olive oil
5 tsp prepared horseradish, divided
1 Tbs Worcestershire sauce, divided
4 Roma tomatoes, halved lengthwise
1 lemon, halved
1/2 red onion, cut into 1/2-inch-thick slices
1 Fresno or serrano chile pepper
1 tsp kosher salt, divided
1 tsp black pepper, divided
1/2 cup Mexican crema
24 corn tortillas
chopped celery and/or green olives and crumbled cotija cheese, for serving

Directions

1. Put pork in a resealable plastic bag set in a shallow dish. Add oil, 1 teaspoon horseradish, and 1 teaspoon Worcestershire sauce. Seal bag; turn to coat. Chill for 30 minutes or up to 4 hours.
2. Prepare an outdoor grill for direct and indirect grilling, lighting burners on just one side or pushing lit coals to one side. Preheat to medium heat (350-375 degrees. Oil grill grates.
3. Grill tomatoes and lemon (cut sides down), onion, and chile over direct heat, covered, turning onion and pepper halfway through, until lightly charred, 6-8 minutes. Remove from heat. Keep grill lit.
4. Remove pork from marinade; discard marinade. Sprinkle pork with 1/2 teaspoon each salt and black pepper. Grill over indirect heat, covered, turning halfway through, 30-35 minutes or until an instant-read thermometer inserted into center registers 145 degrees. Transfer to a cutting board and tent with foil; let rest 10 minutes.
5. Meanwhile, for salsa, finely chop grilled tomatoes and onion, reserving half of onion for serving. Halve, seed (if desired), and finely chop chile. Stir together tomatoes, onion, chile, 2 teaspoons horseradish, 1 teaspoon Worcestershire sauce, the juice from 1 lemon half, and remaining 1/2 teaspoon each salt and black pepper in a bowl.
6. For horseradish crema, whisk together Mexican crema, remaining 2 teaspoons horseradish, and 1 teaspoon Worcestershire sauce in a small bowl.
7. Thinly slice pork and divide among tortillas (2 tortillas per taco). Top with salsa, horseradish crema, and reserved onion. Serve with celery, olives, and cotija. Serve with remaining lemon, cut into wedges.