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To prepare marinara:
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Heat 2 teaspoons oil in a medium saucepan over medium heat.
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Add onion and garlic, cover and cook, stirring frequently, until translucent, 5 to 7 minutes.
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Stir in fresh tomatoes and any juices, sun-dried tomatoes, 1/2 teaspoon salt and 1/2 teaspoon pepper.
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Bring to a simmer and cook, stirring occasionally, until the tomatoes have broken down, 8 to 10 minutes.
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Stir in basil and remove from the heat.
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Transfer to a food processor and pulse to form a coarse-textured sauce.
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Return to the pan and set aside.
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To prepare burgers:
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Place turkey, scallions, garlic, Worcestershire sauce, lemon zest, oregano, 1/2 teaspoon pepper and 1/4 teaspoon salt in a large bowl.
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Gently combine, without overmixing, until evenly incorporated.
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Form into 8 thin patties about 4-inches wide and 38 inch thick.
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Combine 1/4 cup cheese and basil and place an equal amount in the center of 4 patties.
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Cover with the remaining patties and crimp the edges closed.
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Heat 2 teaspoons oil in a large nonstick skillet over medium heat (see Grilling Variation).
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Add burgers and cook, turning once, until an instant-read thermometer inserted in the center registers 165F, 8 to 10 minutes total.
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Warm the marinara on the stove.
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To assemble the burgers, spread 3 tablespoons of marinara on each toasted focaccia, top with a burger, about 3 more tablespoons of marinara and 1 tablespoon of the remaining cheese.
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Grilling Variation:
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To grill the turkey burgers, preheat a grill to medium-high.
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Oil the grill rack.
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Grill the patties, turning once, until an instant-read thermometer inserted in the center registers 165F, 8 to 10 minutes total.