Beef and red wine casserole with mashed potato recipe

Ingredients

• Beef in red wine
• 1 tablespoon vegetable oil
• 300 grams beef chuck steak, trimmed, cut into 2.5 cm pieces
• 1 medium brown onion, thinly sliced
• 1 small zucchini, coarsely chopped
• 1 small carrot, coarsely chopped
• 100 grams button mushrooms, quartered
• 1/3 cup red wine
• 400 grams can chopped tomatoes
• 400 grams potatoes, peeled, chopped
• 1/4 cup milk
• 20 grams butter, chopped
• steamed green beans, to serve