Sauce of Small Shrimp and Scallions (a 5-minute sauce) - Lidia

Ingredients

• 1/2 cup extra-virgin olive oil
• 7 or 8 fat garlic cloves, sliced (about ½ cup)
• About 12 whole Tuscan-style peperoncini in vinegar, drained, seeded and thinly sliced (1/4 cup)
• ½ teaspoon salt
• ½ cup scallions cut into thin rounds
• 1 pound (about 2 dozen) small shrimp, washed, peeled and de-veined
• 4 tablespoons soft butter (½ stick), plus 2 tablespoons for finishing
• Hot water from the pasta cooking pot
• 1/3 cup chopped fresh Italian parsley