Sirloin Steak with Spinach and Onions Recipe

Ingredients For Sirloin Steak with Spinach and Onions Recipe

• 1.25 pound Top sirloin steak, room temperature
• Kosher salt and freshly ground pepper
• 0.33000000000000007 cup Mixed marinated pitted olives, chopped
• 0.25 cup Chopped sun dried tomatoes
• 0.25 cup Extra virgin olive oil, divided
• 0.25 cup White balsamic vinegar, divided
• 1 Large onion, halved and thinly sliced
• 1 bunch Large spinach, thick stems removed
• Lightly toasted crusty bread and butter, for serving