Lots of leftover onions from making Marcella sauce
I've got 3 onions leftover from making Marcella sauce over a week ago. (We didn't use them because we added the sauce to lasagna that was already veg-heavy.) Questions: Are these okay to use? I'm assuming that if they show no signs of funny business, they're fine! And also, HOW should I use them? Rewarm them in stock and blend into an onion sauce?
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OR.... Pickle them!
I'm thinking a topping for a burger, an ingredient for an almost fully cooked ratatouille or in some sort of beef sandwich, or topping for a pizza. They've already been cooked for 45 minutes so no need to cook them further.