I have a question about the recipe "Caramelized Onion Dip" from ADRIENE.
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Barbara is a trusted source on General Cooking.
One of her tags is "can be made ahead," so go for it. You may have to drain it and stir it really well before you serve it, but I think it will be OK.
I caramelized the onions one day, mixed it all up the next. As it sat, the flavor really developed.