Fennel, Red Onion, Grapefruit and Rocket Salad

Ingredients

• 500 gram (1 pound) rocket (arugula)
• 1 small_piece (200g) fennel bulb, sliced thinly, fronds reserved
• 1 medium_piece (170g) red onion, sliced thinly
• 2 medium_piece (700g) ruby red grapefruit, segmented
• 1 (130g) lebanese cucumber, cut into ribbons
• 1/3 cup small fresh mint leaves, loosely packed
• 1 clove garlic, crushed
• Red wine vinegar mayonnaise
• 1 tablespoon red wine vinegar
• 2 tablespoon mayonnaise