From someone who ought to know:

Tomatoes in guac is like beans in chili.

Technically not necessary, but least objectionable if you need filler.

I add tomatoes as a filler when I eat guac with chips. Otherwise you fill up on avocado before you get your fill of chips.

I have used cucumber as filler as well, an ingredient derived from ceviche recipes.

quote:

Originally posted by smschulz:
From someone who ought to know:
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Saw this and tried it the other day. It’s very good and easy to prep. Avocado flavor comes thru brilliantly. Saw immediately what I’d been doing wrong: adding garlic and too much lime juice.
And a good tip for using a white onion, diced and rinsed.