Nibblous | boeuf miroton

Ingredients

• 500g cold boiled or roast beef
• a knob of butter or two tablespoons olive oil
• 250g finely-chopped onions
• 1 tablespoon flour
• half a mugful of beef stock (if you use boiled beef for this recipe, you should have some stock to hand)
• half teaspoon salt
• freshly-ground black pepper
• I tablespoon red wine vinegar - tarragon-flavoured is best
• 2 tablespoons of chopped cornichons and capers
• fresh bread crumbs