Tahini Tuna Salad

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3 tablespoons tahini

1 tablespoon fresh lemon juice

1/2 teaspoon ground cumin 

1 small clove garlic

One 5-ounce can tuna, such as Wild Planet

1 tablespoon chopped fresh parsley, plus more for sprinkling

Kosher salt and freshly ground black pepper 

1 large tomato, sliced crosswise

Sesame seeds, toasted, for sprinkling