INGREDIENTS
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4tablespoonsolive oil
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1medium onion, chopped
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kosher salt and black pepper
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1poundground beef
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114.5-ounce can diced fire-roasted tomatoes with green chilies
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1 1/2cupsbiscuit mix, plus required ingredients
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4ouncesCheddar, grated (1 cup)
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1 1/2poundsassorted fresh tomatoes, cut into bite-size pieces
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1small shallot, thinly sliced
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2tablespoonschopped fresh flat-leaf parsley
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2tablespoonsred wine vinegar