Toast with Lemony Pea Mash

Name: Toast with Lemony Pea Mash
Cuisine: European
Ingredients: 1 garlic clove, quartered; 1/4 cup fresh flat-leaf parsley leaves; 3 tablespoons extra-virgin olive oil, divided, plus more for toast; Kosher salt; 2 cups shelled fresh peas (from about 2 pounds pods) or frozen peas, thawed; 2 tablespoons chopped fresh chives; 1 tablespoon finely chopped preserved lemon peel (from 1/2 preserved lemon), divided; 1 tablespoon (or more) fresh lemon juice; 1/4 teaspoon Aleppo pepper or crushed red pepper flakes plus more for serving; Freshly ground black pepper; 12 slices country-style bread or ciabatta, toasted