Place pork tenderloin between 2 sheets of heavy-duty plastic wrap; pound to 1/4-inch thickness using a meat mallet or small heavy skillet.
Remove plastic wrap.
Cut pork into thin strips.
Combine pork, lime rind, and next 6 ingredients (through salt).
Heat a large nonstick skillet over medium-high heat. Coat pan with cooking spray.
Add shallots to pan; saut for 4 minutes or until tender.
Place shallots in a large bowl.
Add oil to pan.
Add pork; saut for 3 minutes or until no longer pink.
Add pork to shallots.
Warm tortillas according to the package directions. Spoon 1/3 cup pork mixture onto each tortilla, and top each tortilla with 1 1/2 teaspoons sour cream and cilantro. Fold in half.