Mouthwatering slow cooker lamb shanks with red wine sauce

Ingredients

• 4 large (about 1.5kg) lamb shanks, trimmed
• 2 tablespoons plain flour
• 1 tablespoon olive oil
• 1 large red onion, chopped
• 2 garlic cloves, thinly sliced
• 2 medium red capsicum, cut into 3cm pieces
• 2 medium zucchini, halved, thickly sliced
• 1 small (350g) eggplant, cut into 3cm dice
• 2 sticks celery, thickly sliced
• 2 x 440g cans chopped tomatoes
• 2 tablespoons tomato paste
• 1/2 cup (125ml) red wine
• 1 cup (250ml) beef stock
• 2 tablespoons fresh oregano, chopped
• 1/4 cup fresh basil, shredded
• Salt, to season