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preheat the oven to 425°.
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put the tomato in a small baking dish and rub with oil.
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turn the halves cut side down and bake for 20 minutes, until they start to soften.
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let cool, then peel and chop the tomato.
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transfer to a blender; add the vinegar, paprika, tomato paste, garlic, sugar and the 1/4 cup of oil and blend.
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season with salt, pepper and hot sauce.
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in a large bowl, using your hands, blend the ground chuck with the bacon.
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form the mixture into 4 patties.
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heat a large skillet.
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season the burgers with salt and pepper and cook over moderate heat until well-browned on the outside and barely pink in the center, 4 minutes per side.
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butter the buns and place an onion slice on the bottom halves.
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top with the burgers and some dressing, close the burgers and serve.