Beef stir-fry

Ingredients

• 2 teaspoons cornflour
• 4 tablespoons water
• 2 tablespoons soy sauce
• 1 splash of sesame oil
• 3 tablespoons peanut oil
• 400 grams rump or scotch steak, trimmed and thinly sliced, at room temperature
• 1/2 teaspoon salt
• 1 large red pepper, halved, core removed, deseeded and cut into strips
• 2 small hot red chillies, seeds removed if preferred, finely chopped
• 1 bunch spring onions, trimmed and sliced
• 1 tablespoon ginger, peeled and grated
• 2 cloves garlic, peeled and chopped
• toasted sesame seeds, to serve