INGREDIENTS
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1 tablespoon oil, plus more for searing
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1/2 red bell pepper, thinly sliced
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1/2 yellow bell pepper
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1/2 white onion, thinly sliced
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1/2 teaspoon salt, plus more seasoning
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1/2 teaspoon black pepper, plus more for seasoning
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3 cloves garlic, minced
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2 pounds flank steak, flattened as much as possible
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1 1/2 cups spinach
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1/3 cup shredded mozzarella cheese
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Long toothpicks or short skewers