1.
Heat butter and olive oil in a large saucepan over medium-low heat. Cook onion and garlic until onion is soft and translucent, about 5 minutes. Add tomatoes, water, sugar, celery seed, oregano, red pepper flakes, salt, and pepper. Bring to a boil. Reduce heat, cover, and simmer for 15 minutes.
2.
Remove from heat and puree with an immersion blender. Reheat soup until warm and season with salt and pepper.
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