I learned that when I was a child. I always preferred stew when it was a couple of days old at least. "When all the ingredients have got to know each other," as I used to put it.
I never eat stews/casseroles the same day. Make a big bucketful, let it sit a day or two, eat some and freeze the rest in meal-sized portions. Then simply defrost, heat, add Bisto and .... jacket potatoes, dumplings, Yorkshire puddings or a hunk of bread.
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