I've made this Roman recipe probably a dozen times and everyone who's tried it really likes it [1].
The strange ingredients are garum [2] and asafoetida [3]. The former is just a fish sauce, so that's not hard to substitute, but you have to find asafoetida on the Internet or at an Indian food store.
I can usually find hing (asafoetida) in grocery stores in certain more populous parts of Canada in the spice section, it's quite a good garlic substitute for those who can't do garlic
It's used by Janes as eating root vegetables like onions or garlic is discouraged or forbidden in that religion [1].
(Un)related: onions and garlic are pretty close to each other. Chicago is named after šikaakwa, [2] the native word for the local Allium that's alternately called "wild onion" or "wild garlic" in English [3]. You can hear a similar word for onion in a different Algonquin language, Ojibwe [4].
Came here to mention Max Miller as well. Amazing work putting together historical context and recipes. Always fun, fascinating, and the recipes are generally very approachable.
I've also made the Babylonian stew from this recipe, and it's rich and hearty. It's easy to see how this would knock the...sandals off of ancient people.
Other ancient recipes...let's just say that humans have very much not held the same tastes over the eons. Some recipes were incongruent or sweet and savory in a strange way, or simply a flex about how many spices you had access to and cold throw in a dish, not about what it really tasted like. YMMV.