Barbecued Fillet of Beef with Caramelised Radish and Onion

Ingredients

• 1.5 kilogram beef eye fillet
• 1 cup (250ml) dry red wine
• 8 clove garlic, sliced thinly
• 4 fresh thyme sprigs
• 4 fresh bay leaves
• 1/2 teaspoon cracked black peppercorns
• 1 tablespoon olive oil
• 60 gram trimmed watercress
• 1/4 cup (55g) caster (superfine) sugar
• 1/4 cup (60ml) white wine vinegar
• 1 red onion (170g), cut into thin wedges
• 6 radishes (240g), cut into wedges