In a bowl, mash the avocado and combine with the drained tuna.
Add olive oil, lemon juice, herbs, and optional chopped veggies. Mix well until creamy.
Season with sea salt and pepper to taste.
Spoon the mixture into lettuce leaves to create little “boats.”
Garnish with extra herbs, a slice of avocado, or a sprinkle of hemp seeds, if desired.
Serve immediately or store the tuna-avocado mixture in the fridge for up to 2 days (assemble boats just before serving for best texture).