Flank Steak on Thai Mango Salad

Name: Flank Steak on Thai Mango Salad
Prep time: 30 min
Cook time: 10 min
Total time: 40 min
Cuisine: Asian, Thai
Ingredients: 0.25 cup light soy sauce; 0.25 cup vegetable oil; 3 cloves garlic, slivered; 1 slice fresh ginger root; 1 (12 ounce) flank steak; 1 green mango, slivered; 2 cups salad greens; 1 cup bean sprouts; 1 carrot, shredded; 0.5 cup snow peas, thinly sliced; 0.25 cup chopped roasted peanuts; 2 tablespoons coarsely torn fresh mint; 3 tablespoons coarsely torn fresh cilantro; 3 tablespoons coarsely torn fresh Thai basil; 1 green onion, sliced diagonally; 3 tablespoons lime juice; 3 tablespoons fish sauce; 2 tablespoons vegetable oil; 2 tablespoons brown sugar; 1 tablespoon soy sauce; 1 tablespoon minced shallot; 1 Thai chile pepper, thinly sliced, or to taste