For the Green Goddess dressing:

• 2 cups packed soft green herbs (basil, parsley, cilantro, tarragon and chives all work well but avoid mint!)
• 1 cup Greek yogurt (5% fat preferred)
• 3 tablespoons mayonnaise
• zest of 1/2 medium lemon
• 1 1/2 tablespoons fresh lemon juice, plus extra to taste
• 1 tablespoon extra virgin olive oil
• 1/4 teaspoon kosher salt, plus extra to taste
• 3 anchovies, packed in oil
• 1 garlic clove

For the tuna salad:

• 3 (5-ounce) cans chunk tuna (see note)
• 2 small ribs of celery, chopped
• 2 green onions, thinly sliced
• 1/2 cucumber, deseeded and chopped