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You can use just about any kind of onion for this--Vidalia, Spanish, yellow--it's your choice.
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Slice the stem and root ends off each onion. Peel the onions, but leave them whole.
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Place onions and butter in crock pot and cook on low for anywhere from 12-36 hours. The onions will get deep golden brown and literally fall apart.
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Use right away or freeze for later.
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Suggested uses: in omelets, sandwiches, soups, casseroles, dips, pasta sauce, or alongside any grilled meat.
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Note: If your crock pot is big enough, you can double the amount of onions.