Easy Shrimp Quiche

Name: Easy Shrimp Quiche
Prep time: 10 min
Cook time: 25 min
Total time: 35 min
Cuisine: American, French
Ingredients: 1 1/2 tbsp butter (divided); 1 pie crust (ready-made, thawed); 1 tbsp olive oil; 16 oz raw shrimp (deveined, tailed); 1 garlic clove; 3/4 tsp salt (divided); 1/4 tsp ground black pepper (divided); 3 spring onions (sliced thinly); 4 eggs (medium-sized); 1/3 cup sour cream; 1/3 cup heavy cream; 1/4 cup parsley (finely chopped); 1/2 tsp lemon zest; 1/2 cup cheddar cheese (grated)