For Pickled Grapes:  Place grapes in a heat-proof bowl or jar. Mix sugar, salt peppercorns, allspice, chili flakes, and vinegar in saucepan and bring to a boil. Remove from heat and pour over grapes. Let cool and refrigerate overnight.

For Tacos:  Heat a large skillet over HIGH heat with oil. Meanwhile, toss shrimp in Old Bay seasoning and place in skillet once the oil begins to shimmer. Cook 1-2 minutes or until shrimp are fully cooked. Place 1/8 cup cheese in skillet and lay tortilla over the top. Heat over medium heat until cheese melts. Remove tortilla; repeat with remaining tortillas and cheese.

To serve:  Fill the warm cheese tortilla with shrimp, yogurt, cheese, cabbage, onion, cilantro, and pickled grapes. Finish with a squeeze of lime.