Waldorf with roasted grapes and fennel recipe

Ingredients

• 250g red seedless grapes
• 100g walnut halves
• 2 sticks celery, sliced (any leaves reserved)
• 1 fennel bulb, cored and thinly sliced
• 1 apple, thinly sliced
• ½ x 200g pack speciality radishes, thinly sliced
• 1 x 140g pack red chicory, roughly chopped
• ½ x 20g pack chives, finely chopped
• crusty bread, to serve (optional)
• 2 tbsp Greek-style natural yogurt
• 1 tbsp mayonnaise
• juice of 1 lemon
• 2 tsp Dijon mustard