The problem there is that meat doesn't come in dollars; it comes in kilograms.
If you are paid in meat, you get something like 100 kg of pre-formed frozen ground beef patties. That doesn't have a dollar value unless you can find a buyer for it. Which is pretty easy to do if it's a commodity.
So let's try a more broken example. You get paid in sandstone triangular prisms machined to be 31 mm on the two longer sides, 19 mm on the short side, and 9mm in height. These then have a square(-ish) hole drilled in them, slightly off center, and then the sides are grooved, and the faces engraved. These triangles are called fubaar.
Fubaar have no fixed exchange rate with the dollar. For a job, you are paid 1000 fubaar. The value of a fubaar is very stable. One has been able to purchase the traditional formal attire of Barbazia for exactly 5 fubaar, for over 800 years. But you can't buy much with them on the international market except quuxfruit--which bruises easily, and smells like durian crossed with feet after four days.
At the end of the year, I could report that I earned 1000 fubaar since last year, and mail about 250 of them to the treasury. It's not my problem if the government can't convert them to dollars. They can go buy quuxfruit with it. But the treasury won't take anything but dollars. My only recourse is to say the fubaar represent $0 in income, because they really are essentially worth $0, having no inherent value.
The problem is that the gov't is levying taxes in dollars on income that is not dollars, and exporting the inconvenience of conversion to those least able to get a good conversion rate. Congress has the enumerated power to regulate the value of foreign coin. Why not use it? The Treasury also has the ability to accept foreign coin. For a good length of US history, much commerce was conducted in Spanish silver dollars, not US-minted coin. Those were acceptable for payment of taxes.