I'm generally skeptical about Asian boxed broths. 9 times out of 10, you're better off starting from scratch for even the simplest miso or shoyu-based soups. Tonkotsu broth is the exception. It's a commitment and takes a looooonnnnnng time. So this time, I said, ok, let's see what Costco's got with this Kirkland Tonkotsu…
