Seared Steak with Minted Watermelon

8 ounces thin rice noodles
1 (1-pound) boneless 1-inch-thick beef sirloin steak
1 shallot, finely chopped
1 stalk lemongrass, yellow and pale green part only, finely chopped
1 teaspoon sugar
1/4 cup fresh lime juice
1 tablespoon lower-sodium fish sauce
1/2 small (3 cups) watermelon, rind removed, cut into 1/2-inch cubes
1/2 seedless (English) cucmber, cut in half and thinly sliced
1/2 cup packed fresh mint leaves, finely chopped

Prepare outdoor grill for covered direct grilling on medium. Prepare noodles as label directs. Drain, rinse under cold water, and drain again. Season steak with 1/4 teaspoon each salt and freshly ground pepper. Place steak on hot grill; cover. Cook 12 to 13 minutes for medium-rare or until desired doneness, turning once. Transfer steak to cutting board; let rest 10 minutes. Meanwhile, in large bowl, stir shallot, lemongrass, sugar, lime juice, and fish sauce until sugar dissolves. Thinly slice steak across the grain. Add to bowl, along with watermelon, cucumber, and mint. Toss gently until well mixed. Divide noodles among serving plates. Top with steak mixture and accumulated juices.

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