Combine 1 tablespoon olive oil, 2 teaspoons lime juice, cumin, paprika, and red pepper in a small bowl.
Combine shrimp and spice mixture in a zip-top plastic bag, and seal.
Let stand 15 minutes.2.
Combine 1 1/2 teaspoons oil, 2 teaspoons juice, onions, 1/8 teaspoon salt, rind, apple, and jalapeño; toss.3.
Remove shrimp from bag; discard marinade.
Heat a grill pan over medium-high heat.
Sprinkle shrimp with 1/8 teaspoon salt.
Arrange half of shrimp in pan; grill 2 minutes on each side or until done.
Remove from pan; keep warm.
Repeat procedure with remaining shrimp.
Toast the tortillas in grill pan, if desired.
Place 2 tortillas on each of 4 plates, and divide shrimp evenly among tortillas.
Divide salsa evenly among tacos, and top with queso fresco.
Total price: $9.99 for 4 and $2.50/serving