Beef and black beans

Ingredients

• 1/4 cup chinese rice wine
• 1 teaspoon sesame oil
• 1 teaspoon cornflour, plus 1 teaspoon extra
• 700 gram beef rump steak, trimmed, thinly sliced
• 1/4 cup chicken stock
• 1 teaspoon caster sugar
• 1 tablespoon vegetable or grape seed oil
• 1 tablespoon salted, fermented black beans, rinsed, chopped
• 2 clove garlic, crushed
• 1 medium white onion, cut into wedges
• 1 medium red capsicum, thinly sliced
• 1 medium yellow capsicum, thinly sliced
• green onion curls, to garnish (see notes)