Aioli Steak Sandwich | KARAN BEEF

Ingredients

• 300g rump steak
• Olive oil, for frying
• Mixed salad lettuce leaves
• 1 large tomato, sliced
• Dijon mustard
• 1 medium loaf rosemary ciabatta bread
• Caramelised onions:
• 3 red onions, thickly sliced
• 2 Tbsp butter
• 1 Tbsp olive oil
• 1 Tbsp sugar
• 1 Tbsp balsamic vinegar
• Salt
• Aioli:
• 1 cup tangy mayonnaise
• 1 garlic clove, crushed
• Juice of half a lemon
• Pinch of salt