Steak Sandwich with Chimichurri Sauce - alive magazine

Ingredients

• 1 cup (250 mL) thinly sliced red onion
• 3/4 lb (350 g) organic grass-fed sirloin or flank steak
• 4 tsp (20 mL) grapeseed, sunflower, or camelina oil, divided
• 1 medium sweet potato, peeled and shredded
• 1/2 cup (125 mL) finely chopped flat-leaf parsley
• 2 Tbsp (30 mL) fresh oregano
• 1 garlic clove, minced
• 1/4 tsp (1 mL) salt
• 1/4 tsp (1 mL) black pepper
• 2 Tbsp (30 mL) extra-virgin olive oil or camelina oil
• Juice of 1/2 lemon
• 1/3 cup (80 mL) mayonnaise
• 2 Tbsp (30 mL) prepared horseradish
• 8 slices whole wheat Crusty Italian Sourdough