Skirt Steak French Dip Sandwiches

WHAT YOU'LL NEED

• 1 lb. skirt steak, cut into thin strips
• 2 Tbsp. I Can't Believe It's Not Butter!® Spread
• 1 large onion, thinly sliced
• 1/4 cup dry red wine or water
• 1 package Knorr ® Gravy Classics ™ Au Jus Gravy Mix
• 1 cup water
• 4 large Italian rolls, sliced in half horizontally and lightly toasted