Gluten Free Salad Nicoise

Name: Gluten-Free Salad Nicoise
Ingredients: 1 medium sweet potato; 1/4 teaspoon vegetable oil; 1/4 teaspoon salt; 3 tablespoons orange juice; 1 tablespoon lime juice; 1 tablespoon honey; 1 tablespoon Dijon mustard; 1 finely chopped anchovy fillet; 2 tablespoons extra-virgin olive oil; 1/4 cup chopped parsley; 1/4 cup chopped fresh basil leaves; 1 (12-oz) sashimi-grade tuna steak (or 2 six-oz steaks); 1 teaspoon vegetable oil; 1/2 lb whole green beans, stems removed; 5 oz baby spinach; 4 hard-cooked eggs, cut into wedges; 4 plum (Roma) tomatoes, cut into wedges; 12 kalamata olives