Beef and Sweet Onion Sandwiches

Sweet onions are much milder tasting , and less pungent
than other varieties of onions, you can even use red onions.
The most common varieties are Vidalia, Walla Walla and Maui.

Ingredients:
12 ounces boneless beef sirloin
or top round steak, cut 1-inch thick
1/2 teaspoon coarsely ground black pepper
Salt to taste
2 teaspoons vegetable oil
1 medium sweet onion, sliced
2 tablespoons Dijon-style mustard
1/2 cup roasted red bell peppers (1/2 of a 7-ounce jar, drained)
8 (1-inch-thick) slices sourdough
1 1/2 cups torn spinach or salad greens

Directions:
Trim fat from meat.
Sprinkle both sides of meat with pepper and salt; press in lightly.
In a large skillet cook meat in hot oil over medium-high heat
about 8 minutes or until slightly pink in center, turning once.
Remove from skillet; keep warm.
Add onion to drippings in skillet, adding more oil if necessary.
Cook and stir about 5 minutes or until onion is crisp-tender.
Stir in mustard; remove from heat.
Meanwhile, cut roasted red peppers into 1/2-inch wide strips.
Toast bread, if desired, and shred spinach or salad greens.
Just before serving, thinly slice meat into bite-size strips.
To serve, top 4 bread slices with spinach
or salad greens, meat strips, roasted pepper strips,
onion mixture, and remaining bread slices.