Fried Vegetable Spring Rolls

Name: Fried Vegetable Spring Rolls
Ingredients: 18 fresh or frozen lumpia or spring roll wrappers (not egg roll wrappers); 3 large portobello mushrooms; 1/2 medium green cabbage (11 to 12 ounces); 1 medium red bell pepper (about 8 ounces); 3 large carrots (about 6 ounces); 3 tablespoons olive oil; 1/2 teaspoon kosher salt; 2 tablespoons soy sauce; 1 tablespoon Sriracha hot sauce; 2 teaspoons toasted sesame oil; 1/2 teaspoon ground white pepper; 3 medium scallions; 2 tablespoons water; 1 tablespoon cornstarch; 5 to 6 cupss neutral oil, such as vegetable oil, for deep frying; Sweet chili sauce, for serving