Grilled Tomato Orzo Salad in a Tomato Bowl

Name: Grilled Tomato Orzo Salad in a Tomato Bowl
Ingredients: 1 cup uncooked orzo; 4 cups vegetable broth; 2 bunches fresh basil leaves (~2 cups); 1/3 cup walnuts; 3 garlic cloves, minced; 1 lemon, zested and juiced; salt and pepper, to taste; 1/4 cup parmigiano-reggiano cheese; 1/3 cup olive oil; 4 large beefsteak tomatoes; 1 pint grape tomatoes, halved; 1 tablespoon olive oil; 1 corn cob (or ~1/3 cup frozen corn kernels); 8 ounces mozzarella balls; 1 cucumber, seeded and chopped; mint, for garnish