Corned beef with mustard sauce

Ingredients

• 1.5 kilogram corned beef silverside
• 4 cup (1l) salt-reduced chicken stock
• 1 brown onion, coarsely chopped
• 1/4 cup (60ml) malt vinegar
• 2 tablespoon brown sugar
• 4 whole cloves
• 1 tablespoon mustard seeds
• 5 whole black peppercorns
• 2 bay leaves
• 500 gram chat (baby) potatoes
• 400 gram baby carrots, peeled, trimmed
• 200 gram green beans, trimmed
• Mustard sauce
• 50 gram butter
• 2 tablespoon plain flour
• 1 1/4 cup (310ml) milk
• 2 tablespoon wholegrain mustard