This is perhaps a bit less of a frugality hack and more of a bang-for-your-buck hack, in that steak isn’t frugal.
DH and I love steak. **(The kids aren’t interested yet.) **We’ve recently been doing a thing where I’ll buy an economy-size pack of, say, T-bone steaks (nice flavor), and then freeze each one in a separate Ziploc bag. For a weekly “date night,” I’ll pull one steak out, defrost it, grill it, and then split it between us with accompanying fruit and veggies. Much, MUCH cheaper than eating out, of course, and also healthier in that the portions are far smaller than restaurant ones. Just do be sure to use them up fairly quickly, since as others have pointed out, it’s easy for food to get freezer-burned in a standard freezer.
(Before the true frugalistas here have heart attacks, I point out once again that I
do know that this isn’t frugal per se, but on the other hand, paying about $3.50/serving for a steak dinner for two ain’t half bad as splurges go.)