Salty, umami-packed prosciutto complements the sweet shrimp and tomatoes in this streamlined 20-minute main.
Cook pasta according to package directions, omitting salt and fat. Drain, reserving 1 cup cooking liquid.
Cook prosciutto and 2 tablespoons oil in a large skillet over medium-high, stirring often, until prosciutto is crisp, 3 to 4 minutes. Transfer prosciutto to paper towels to drain. Add garlic to pan; cook, stirring often, until golden, 1 to 2 minutes. Add tomatoes, 1/4 cup basil, salt, and red pepper. Cook until tomatoes begin to release their juices, about 4 minutes. Add shrimp; cook until opaque, 3 to 4 minutes. Stir in up to 1 cup reserved cooking liquid to thin sauce to desired consistency.
Halve 1 lemon; squeeze juice from both halves into sauce. Stir in pasta and remaining 2 tablespoons oil. Cut remaining lemon into wedges. Divide pasta evenly among 4 plates; top with prosciutto and remaining 1/4 cup basil. Serve with lemon wedges.