Tequila Glazed Shrimp Salad Flambe

Name: Tequila Glazed Shrimp Salad Flambe
Ingredients: 1 cup sugar; 1 cup cider vinegar; 1/2 teaspoon crushed red pepper flakes; 1 jalapeno, seeded and minced; 12 ounces spinach, stemmed, washed and torn; 1/2 red bell pepper, julienned; 1/2 mango, peeled and thinly sliced; 1/4 cup cider or sugar cane vinegar; 3/4 cup olive oil; Kosher salt and freshly ground black pepper; 4 tablespoons butter; 12 large shrimp, peeled and deveined (about 12 ounces); 3 ounces tequila, plus more to taste