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Brush tomatoes with 1 tablespoon of the olive oil and sprinkle with 1 teaspoon of the garlic powder.
Grill tomatoes and onions, cut side down over high heat, turning occasionally and grilling until lightly charred on all sides. Cool slightly. Coarsely chop onions. Set aside.
Heat remaining 1 tablespoon oil in large saucepan on medium-low heat. Add charred onion and celery; cook about 5 minutes or until softened. Stir in charred tomato, remaining garlic powder and remaining ingredients until well blended. Bring to boil; reduce heat to low and cook 40 minutes, stirring occasionally. Allow to cool.
Transfer charred tomato mixture to blender container, working in batches if needed. Cover. Blend until smooth. Serve with Carrot Hot Dogs.