Philly steak nachos recipe

Ingredients

• 2 x 225g/8oz sirloin steaks
• 170 g jar of cornichons
• 1 tbsp sunflower oil
• 1 green pepper, deseeded and finely diced
• 1 onion, finely sliced
• 200 g tortilla chips
• 1 tbsp jalapeño chillies, from a jar
• 1 pinch each of sea salt flakes and freshly ground pepper
• 30 g unsalted butter
• 30 g plain flour
• 250 ml milk
• 150 g red Leicester, grated