Grilled Steak Wraps with Peanut Sauce

Name: Grilled Steak Wraps with Peanut Sauce
Ingredients: 1/2 c. creamy peanut butter; 1/2 c. canned coconut milk; 1/4 c. fresh lime juice; 1 tsp. fish sauce; 1/2 tsp. chili oil; 2 garlic cloves, grated; 1 1-inch piece fresh ginger, grated; 1 tbsp. olive oil; 1 tsp. sugar; 1 tsp. chili oil (optional); 4 radishes, cut into thin sticks; 1 c. shredded carrots; 2 romaine lettuce hearts, shredded; 2 scallions, thinly sliced; 1/2 c. fresh cilantro; 2 skirt steaks (about 2 1/4 pounds total), each cut crosswise into 3 pieces; Kosher salt and black pepper, to taste; 12 8-inch whole-wheat tortillas