How to Make It
Heat 1 tablespoon of the oil in a Dutch oven over medium-high. Sprinkle shrimp with 1⁄4 teaspoon of the salt. Add shrimp to Dutch oven; cook until cooked through, 3 to 4 minutes, stirring once. Remove shrimp; set aside. Pour off any remaining drippings from Dutch oven. Add remaining 1 tablespoon oil. Add bell pepper, snap peas, and shallot, and cook, stirring often, until vegetables are tender, about 4 minutes. Add bell pepper mixture to shrimp; cover to keep warm.
Add pasta, stock, and remaining 1⁄2 teaspoon salt to Dutch oven; bring to a boil over medium-high. Boil pasta, stirring occasionally, until pasta is almost tender and stock is almost absorbed, about 9 minutes. Add spinach and Broccolini; cook until spinach is wilted, 1 to 2 minutes. Stir in shrimp mixture and vinegar. Remove from heat. Divide mixture evenly among 4 bowls; top with cheese and red pepper.