Step 1. Sauté Aromatics
In a deep skillet, heat the olive oil over medium heat. Add the onion, season with a pinch of sea salt, and sauté for 7–8 minutes until softened. Stir in the garlic, red pepper flakes, tomatoes, and water. Raise heat to medium-high and bring to a boil.
Step 2. Simmer the Sauce
Add ¼ cup ouzo and orange zest. Lower heat, season again, and simmer 20–25 minutes until thickened.
Step 3. Cook the Shrimp
In another skillet, melt butter over medium heat. Add shrimp, season, and cook until just turning pink. Add reserved heads and tails plus remaining ouzo. Sauté on high until ouzo cooks off (~5 minutes). Discard heads and tails.
Step 4. Boil the Pasta
Cook pasta until al dente in generously salted water. Drain, reserving 1 cup of pasta water.
Step 5. Combine and Finish
Mix shrimp and pan juices into the sauce. Adjust seasoning, stir in herbs. Toss in pasta, adding some pasta water if needed. Serve immediately with a drizzle of Greek olive oil.