For the Tacos, mix oil, soy sauce, honey, lime juice, garlic, ginger, lemon peel and sea salt in small bowl until well blended. Place steak in glass dish. Rub seasoning mixture all over steak. Cover. Refrigerate 1 hour or longer for extra flavor.
Meanwhile, for the Salsa, heat oil in large skillet on high heat. Add mushrooms; cook and stir 4 minutes or until golden brown. Add shallots and chipotle chile pepper; cook and stir 3 minutes or until shallots begin to brown. Spoon mushroom mixture into medium bowl. Add remaining ingredients; toss lightly.
Grill steak on medium-high heat 3 to 4 minutes per side or until medium-rare doneness. Remove steak to cutting board. Let stand 5 to 10 minutes before slicing.
To serve, slice steak across the grain into thin slices. Serve in warmed flour tortillas topped with Spicy Mushroom Salsa.