Key tips: Dry shrimp are essential – pat them thoroughly or they'll steam instead of sear. Cook just until opaque; even 30 seconds too long makes them tough. Add lemon zest off the heat for maximum freshness. For dairy-free, substitute good-quality olive oil for butter. Add a handful of spinach or cherry tomatoes with the garlic for extra vegetables. To make it kid-friendly, skip the red pepper flakes and add a teaspoon of honey to the butter. Leftover cooked shrimp keep in the fridge for up to 3 days; reheat gently in a skillet.