Tuna and Avocado Salad with Fermented Onions (with Cutter)

Avocado Tuna Salad

• 1 English cucumber halved lengthways
• 2 oz watercress
• 1 ½ oz red onions fermented or pickled
• 8 oz avocado diced, divided
• 2 cans tuna, packed in water drained (5 oz ea. can)
• 2 tbsp sunflower seeds
• 3 sprigs fresh basil leaves only
• 3 sprigs mint, fresh leaves only
  or 3 sprigs parsley leaves only
• 2 oz extra virgin olive oil
• 1 ½ oz white vinegar
• ¼ tsp salt to taste
• ⅛ tsp freshly ground black pepper to taste