Salad of Seared Tuna with Seedless Watermelon, Grapefruit and Avocado - A better choice!

Ingredients

• 360g fresh sushi grade tuna
• ¼ medium watermelon, cut in cubes
• 1 avocado, cut into slices
• Small tin of Baby capers
• 1 grapefruit, cut into segments
• 1 small green onion, sliced thinly
• ¼ cup continental parsley leaves
• Cos lettuce leaves, torn
• 1 lemon
• 30ml extra virgin olive oil
• Salt and freshly ground black pepper