Preheat oven to 400 degrees F (200 degrees C).
Line a baking sheet with aluminum foil. Halve the Sweet Potato (1) and poke a couple of holes with a fork. Drizzle with olive oil and season with salt. Bake skin down for 40 minutes.
In a small bowl, mash Avocado (1) with Garlic (1 clove), Lemon Juice (1 teaspoon), and season with Salt (to taste) and Ground Black Pepper (to taste).
Mix Canned Tuna (1/4 cup), Onion (1), Sour Cream (2 tablespoon), Cream Cheese (1 tablespoon), Capers (2 tablespoon), and Fresh Dill (1 teaspoon) in a medium bowl. Season with salt and pepper if needed.
Remove sweet potatoes from the oven and let them cool for 5-8 minutes.
Spread one half with the tuna mix and garnish with capers and fresh dill.
On the other half, spread the avocado mix and garnish with Pickled Onions (to taste) and Grated Parmesan Cheese (to taste).