Ingredients: 
1 pound boneless beef round tip steak, cut 1-inch thick
1/2 small red onion, cut into 3/4-inch wedges
1 small yellow summer squash, cut lengthwise in half then crosswise into 1-inch slices
1 small red or green bell pepper, cut into 1-inch pieces 
Marinade:
2 tablespoons water
2 tablespoons coarse-grain Dijon-style mustard
2 tablespoons red wine vinegar
2 large cloves garlic, minced
2 teaspoons vegetable oil
1/2 teaspoon coarse grind black pepper
2 teaspoons vegetable oil
2 cups thinly sliced mixed mushrooms such as cremini or shiitake
1 (6-ounce) package wild rice blend