But when she first gave me this recipe, a can of tuna did not hold 7 oz. My recollection is that it was 6¾ oz. That was about 30 years ago.
A can of tuna has shrunk progressively (Is that right?) in the year since. About a year or so ago I first noticed it was now down to 5 oz. That's so they can still sell it at the grocery store for, when my brand is on sale (Sorry, Charlie, I listen to the mermaid.) , 99¢.
So now I use 3 cans.
It also calls for "1½ c. dairy sour cream (12 oz.)." Alas, a container of sour cream, for which apart from this casserole I have no need for, is 16 oz.
You shall not have in your bag two kinds of weights, a large and a small. You shall not have in your house two kinds of measures, a large and a small. A full and just weight you shall have, a full and just measure you shall have; that your days may be prolonged in the land which the LORD your God gives you. For all who do such things, all who act dishonestly, are an abomination to the LORD your God.
- Deuteronomy 25:13-16 RSV