Tan round eggs underneath herb leaf

That is weird, the picture is a little blurry, but I don't think those are insect eggs, and ants would never guard insect eggs, they will
"farm" aphids and scale insects for honeydew, I think the ant is either just a coincidence or a predator.
In any event, I doubt those are anything beneficial to your garden, and you certainly can't make salsa with those things on your cilantro.
You can always clip off the leaf and put it in a closed container and see what happens.

I'm surprised no one else gave this one a try, very few id requests go unsolved, it seems there's usually someone who pins it down. I'm
always learning about some insect I've never heard of, because there are a lot of them-
The rest of the plant is probably ok for consumption, and herbs are fairly hardy most of the time.

They could possibly be eggs of a Hemipteran bug. Try cutting the leaf around them to leave just a small amount of leaf below them and put them into a sealed plastic container and see what happens. The reason you should not just put the whole leaf into a box is that the eggs may suffocate from carbon dioxide emitted by the leaf in an enclosed space. There is no need to put "air holes" in the container. As long as there is only a small amount of leaf below the eggs they will be fine inside a sealed box.

Adam.