Specialty Extra Topping

You're referring to specialty toppings or extras that are commonly found in restaurants in the USA. Here are some popular ones:

1. Bacon: Thinly sliced, crispy, smoked, or cured pork belly that adds a smoky, savory flavor to dishes like burgers, salads, and sandwiches.

2. Avocado: Mashed or sliced, avocado adds a creamy, nutritious twist to dishes like burgers, salads, tacos, and toast.

3. Guacamole: A creamy dip or spread made from avocados, often served with tortilla chips or as a topping for burgers, sandwiches, and salads.

4. Caramelized Onions: Slow-cooked onions that are sweet, caramel-like, and add a depth of flavor to dishes like burgers, sandwiches, and salads.

5. Mushrooms: Sautéed or grilled, mushrooms add an earthy flavor and meaty texture to dishes like burgers, sandwiches, and salads.

6. Jalapeños or Hot Peppers: For those who like a little heat, jalapeños or other hot peppers can be added to dishes like burgers, tacos, and salads for an extra kick.

7. Grilled Pineapple: Sweet and savory, grilled pineapple is often paired with ham, bacon, or chicken to add a tropical twist to dishes like burgers, salads, and sandwiches.

8. Fried Egg: A fried or poached egg that adds a rich, creamy element to dishes like burgers, salads, and sandwiches.

9. Roasted Garlic: Mince garlic that's been roasted to bring out its natural sweetness, often used to add flavor to dishes like burgers, sandwiches, and salads.

10. Pesto: A flavorful sauce made from basil, garlic, and olive oil, often used as a topping for dishes like pasta, pizza, and sandwiches.

These are just a few examples of specialty toppings you might find in restaurants in the USA. Of course, the options can vary greatly depending on the type of cuisine and region!