Barbecued prawn salad with basil mayo

Ingredients

• Basil mayo
• 1/2 cup (150g) whole-egg mayonnaise
• 1 large avocado (320g), coarsley chopped
• 1/2 clove garlic, crushed
• 1 1/2 tablespoon wasabi paste
• 1 1/2 tablespoon lime juice
• 1/4 cup coarsely chopped fresh basil leaves
• 1 tablespoon water, approximately
• 24 medium green prawns (shrimp) (1kg)
• 1/4 cup (60ml) vegetable oil
• 1/3 cup (80ml) lime juice
• 4 cloves garlic, crushed
• 1 teaspoon chilli flakes
• 80 grams (2½ ounces) baby rocket leaves
• 4 lebanese cucumbers (520g), sliced lengthways into ribbons