marinated oriental beef salad

Ingredients

• 1 - (1 to 1 1/4 pounds) flank steak
• 1/3 cup lemon juice concentrate
• 1/4 cup catsup
• 1/4 cup vegetable oil
• 1 tablespoon brown sugar
• 1/4 teaspoon garlic powder
• 1/4 teaspoon ground ginger
• 1/4 teaspoon pepper
• 8 ounces fresh mushrooms, sliced (about 2 cups)
• 1 can (8-ozs.) sliced water chestnuts, drained
• 1 - sweet onion, sliced and separated into rings
• 1 package (6-oz) frozen pea pods, thawed
• - lettuce leaves
• - tomato wedges