Confit Turkey With Chiles and Garlic

Name: Confit Turkey With Chiles and Garlic
Ingredients: 1 Tbsp. light brown sugar; 2 tsp. cracked black pepper; 2 Tbsp. plus ¼ tsp. kosher salt; 2 whole turkey legs (4–5 lb. total); 6 garlic cloves, smashed, plus 2 heads of garlic, divided; 8 guajillo, ancho, or New Mexico chiles, stems and seeds removed; 4 sprigs oregano or 1 tsp. dried oregano; 3–4 cups (or more) extra-virgin olive oil; 2 tsp. (or more) crushed red pepper flakes; ½ cup unsalted roasted almonds or peanuts; ¼ cup toasted sesame seeds