Pulse the beans, 4 of the sun-dried tomatoes, 2 tablespoons of the oil, 2 tablespoons water, vinegar, granulated garlic and 1/2 teaspoon salt in a food processor until blended and semi-smooth.
Thinly slice the 2 remaining sun-dried tomatoes. Gently toss them with the tuna, olives, roasted red peppers, the 2 remaining tablespoons oil, red pepper flakes and a few grinds of black pepper in a medium bowl, breaking up the tuna slightly.
Heat a griddle or large skillet over medium-high heat. Brush one side of the pitas with oil, lay the oiled side on the griddle and cook until lightly charred in spots, about 1 minute. Transfer, charred-side up, to serving plates.
Spread some of the bean mixture on each pita, and top with some of the tuna-olive salad. Drizzle each with oil, and sprinkle with black pepper.
From Food Network Kitchen