1For Romesco sauce, place the first 9 ingredients in a blender and process until smooth.
2To prepare filling, heat a medium saucepan over medium-high heat. Add 1 tablespoon oil to the pan; swirl to coat. Add onion, saute 4 minutes or until the onion begins to brown. Add 1 teaspoon garlic and ginger; saute 30 seconds, stirring constantly. Stir in quinoa; cook 1 minute, stirring constantly. Add broth, 3/8 teaspoon salt, and 1/4 teaspoon black pepper; bring to a boil. Cover and simmer 20 minutes or until quinoa is tender and the liquid is absorbed.
3Combine quinoa mixture, parsley, dill, and chickpeas in a bowl.
4Cut the tops off the tomatoes; set aside. Carefully scoop out the tomato pulp, leaving the shells intact. Discard the pulp. Divide quinoa mixture evenly among the tomato shells; replace the tomato tops. Spoon romesco sauce around the stuffed tomatoes.