Shrimp and Tomato Toasts

Name: Shrimp and Tomato Toasts
Ingredients: 4 garlic cloves, 1 whole, 3 thinly sliced; 1 large egg yolk; 1 tsp. plus 1 Tbsp. fresh lemon juice; 2½ tsp. Diamond Crystal or 1¼ tsp. Morton kosher salt, divided, plus more; ½ cup plus ⅓ cup (or more) plus 4 Tbsp. extra-virgin olive oil; 1 lb. tail-on large shrimp, peeled, deveined; 4 thick slices crusty bread; 2 pints cherry tomatoes; 1 Tbsp. sherry vinegar or red wine vinegar; 1½ tsp. smoked paprika; 1 tsp. ground cumin; ½ tsp. mild chile flakes, plus more for serving; Chopped parsley (for serving)