Thai Peanut Beef

Ingredients

• 1/4 cup creamy peanut butter
• 1 tablespoon soy sauce
• 1 tablespoon brown sugar
• 2 teaspoons sriracha
• 2 tablespoons water
• 2 tablespoons vegetable oil
• 1 1/2 pounds flank steak, thinly sliced across the grain
• kosher salt, to taste
• black pepper, to taste
• 1 green onion, thinly sliced
• 2 tablespoons peanuts, chopped