1 beef top round steak, 1/8 to 1/4 inch thick (1 lb.)
1 jalapeño pepper, finely chopped
2 Tbsp. sesame oil, divided
1 pkg. (3 oz.) beef-flavored instant ramen noodle soup mix
1 cup diagonally sliced carrots
1/2 cup green onion slices
1/4 cup dry roasted unsalted peanuts