Cook spaghetti until al dente. Reserve 1/2 cup pasta water, then drain.
Pat shrimp dry and season with some salt and pepper.
Heat olive oil and 1 tbsp butter in a large skillet over medium-high.
Sear shrimp 1 to 2 minutes per side until just opaque; transfer to a plate.
Lower heat. Melt remaining butter; sauté garlic and red pepper 30 seconds.
Pour in broth and simmer 2 minutes. Stir in lemon juice and zest, scraping bits.
Add pasta and shrimp. Splash in pasta water to loosen. Fold in Parmesan and parsley.
Taste and adjust salt, pepper, and lemon. Serve hot.
Notes
Variation: Swap the broth for dry white wine and add a pat of butter at the end for extra gloss. Storage: Refrigerate leftovers up to 2 days; rewarm gently with a splash of water or broth.This recipe is an original creation inspired by classic Lemon Garlic Shrimp Pasta Delight flavors. All ingredient ratios and instructions are independently developed.