Stirfry beef with black bean sauce - Georgina O'Sullivan Cooks

Ingredients

• 220g sirloin steak, trimmed and thinly sliced
• 200g vegetables, thinly sliced
• 1 dessertspoon cornflour
• 1 tablespoon soy sauce
• 1 tablespoon oyster sauce
• 1 tablespoon black vinegar
• 1/2 tablespoon sunflower oil
• 2 cloves garlic, chopped
• 2 teaspoons fermented black beans, chopped
• thumb size piece of ginger, chopped
• 1 red chilli, chopped
• 200ml chicken stock