A cold bean dish I make uses any variety of beans you want and it usually has a definite sweet/sour character unless I skip the sweet ingredients.
The simplest version takes your favorite can of baked beans (which can have a touch of sweetness due to sugar, ketchup, bbq sauce type ingredients) to which I add a large chopped onion and rice vinegar to taste, mix, then let it sit in the frig marinating for at least a few hours, better overnight. I eat it cold or I prefer at room temp.
I've also used a seven bean chili recipe I have and then add the onion and rice vinegar to end up with a "fancier" version of the above.
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