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Sort and wash beans, and place in a large Dutch oven. Cover with water to 2 inches above beans; cover and let stand 8 hours or overnight.
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Drain beans.
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Combine beans and crushed red pepper in pan; add water.
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Bring to a boil; reduce heat and let simmer 1 1/4 hours or until beans are tender.
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Drain in colander over a bowl, reserving 1 cup cooking liquid; discard remaining liquid.
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Return beans and cooking liquid to pan. Stir in 1 teaspoon salt.
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Remove from heat and keep warm.
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Preheat oven to 325 degrees.
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Heat oil in a large nonstick skillet over medium-high heat.
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Add onion and 3/4 teaspoon salt; cover and cook 15 minutes or until golden brown, stirring occasionally.
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Add bell pepper and garlic; cook 1 1/2 minutes or until pepper is crisp-tender, stirring frequently.
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Add tomato; cook 1 1/2 minutes, stirring frequently.
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Remove from heat. Stir in sugar, mint, paprika and black pepper. Add onion mixture and 1/2 teaspoon salt to bean mixture, stir well to combine.
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Cover and bake at 325 degrees for 1 hour.
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Stir in vinegar.
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Serve.