Crispy Scallop Salad

Name: Crispy Scallop Salad
Ingredients: 1/2 cup cornstarch; 1/2 cup fine-grind yellow cornmeal; 2 tsp. Old Bay seasoning; 1/2 tsp. baking powder; 3 tsp. kosher salt, divided, plus more; 1 tsp. freshly ground black pepper; 2 large eggs; 1 lb. sea scallops (about 16), side muscle removed, patted dry; Vegetable oil (for frying; about 2 cups); 1/4 cup extra-virgin olive oil; 1/2 tsp. finely grated orange zest; 1/4 cup fresh orange juice; 2 Tbsp. white wine vinegar; 1 garlic clove, finely grated; 3 small or 2 large Belgian endive, root trimmed, leaves separated; 3 small or 2 large oranges, peel and pith removed, cut into segments; 1 avocado, sliced; 1/2 cup basil leaves