Is this it? I haven't tried it either

Crock Pot Pepsi Pot Roast Recipe

1 medium sized beef roast

1 can of pepsi

1 16 - 24 oz. jar of picante sauce

1 package dried onion soup mix

Put roast in crock pot and pour the pepsi, picante sauce, and soup mix over the top of the roast.

Cook on low for 7-10 hours.

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