This sandwich is all about healthy fats, with omega-3 fatty acids in the tuna and monounsaturated fat in the avocado. The first boosts brain function; the second is great for heart health. Tuna and avocado also happen to taste delicious together, along with pickled onion, roasted almonds, and briny, pea-green Castelvetrano olives. You’ll want a sturdy loaf of sourdough to support the filling; be sure to buy from the bakery section of the supermarket.
Bring onion, vinegar, 1/4 cup water, and sugar to a boil in a small saucepan over medium-high. Remove pan from heat; let stand 5 minutes. Drain.
Divide the avocado slices evenly among bread slices; mash with a fork. Sprinkle with 1/4 teaspoon salt and 1/4 teaspoon pepper. Top evenly with tuna, onions, parsley, almonds, and olives. Sprinkle with remaining 1/4 teaspoon salt and remaining 1/4 teaspoon pepper.
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