Sliced steak with caramelised red onions - Irish Beef

Ingredients

• 4 steaks, sirloin, ribeye or striploin
• 1-2 tbsp . sherry vinegar
• 2 tbsp. rapeseed oil
• Salt and cracked black pepper
• A knob of butter
• 2 large red onions, peeled and finely sliced
• 150g créme fraîche
• 2 tbsp. horseradish sauce
• 1 /2 tsp. Dijon style mustard
• 1/2 tsp. white wine vinegar/lemon juice
• 4 thick slices of bread
• 120g rocket leaves
• Ingredients
• Method