Vietnamese Steak Sandwich

Name: Vietnamese Steak Sandwich
Ingredients: 1 teaspoon Thai-style chili sauce (also called sriracha, found in the international aisle of most supermarkets); 4 teaspoons sugar; 1 1/2 tablespoons fish sauce (also found in the international aisle); 1 teaspoon minced garlic; 1 6-ounce piece of top round steak, about 1 inch thick; 1 cup rice wine vinegar (also found in the international aisle); 3 radishes, thinly sliced; 1 medium carrot, cut into matchsticks; 1/2 medium yellow bell pepper, thinly sliced; 1 6-ounce (8-inch) baguette, sliced horizontally; 4 tablespoons mayonnaise; 6 sprigs fresh cilantro