Vietnamese Burgers | Savory

Ingredients

• 1 cucumber
• 1/2 small red onion
• 1/4 cup cider vinegar
• 1 1/4 lbs 85% lean ground beef
• 1 cup shredded carrots
• 2 tbsp mayonnaise
• 1 tbsp Sriracha
• 4 romaine lettuce leaves
• 4 ciabatta rolls
• 1/4 cup chopped peanuts