Mediterranean inspired fish tacos

Name: Mediterranean inspired fish tacos
Ingredients: olive oil; 2 tablespoons finely diced red onion; 3 tablespoons sherry vinegar, divided; 3 teaspoons honey, divided; 2 meyer lemons; 1/2 cup pitted green olives (of your favorite variety), chopped; 3 tablespoons chopped fresh cilantro; 1 fennel bulb; 2 cups shredded red cabbage; 2 teaspoons whole grain mustard; sea salt; 1 1/2 - 2 pounds tilapia or flounder fillets (or any other white fish that you can find wild/locally caught); 2 teaspoons hot paprika; 2 teaspoons dried thyme; freshly ground black pepper; plain yogurt, for serving; 8 flour tortillas, for serving