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?