2 medium zucchini, about 8 oz each
1/2 tbsp unsalted butter
2 tsp extra virgin olive oil. divided
4 minced garlic cloves, divided
12 large peeled and deveined shrimp (about 6.5 oz)
kosher salt, to taste
freshly ground black pepper
1 tbsp chopped fresh parsley leaves
1/2 tsp fresh grated lemon zest
3 tbsp freshly squeezed lemon juice (from 1 lemon)
1/8 tsp hot red pepper flakes