Learn Portuguese (Portugal): Eu como o almoço no trabalho.

The verb is comer (to eat). Since it is a regular -er verb, you find the Eu (I) form by dropping the -er ending and adding -o, which gives us como.

Wait, doesn't como also mean "how" or "like"?

Yes, it is the exact same word! But because it comes right after Eu (I), the context tells us it is the verb meaning "I eat" rather than the question word "how".

Why is there an o before almoço?

In English, we just say "I eat lunch", but Portuguese often places a definite article like o (the) before meals and everyday nouns. You are literally saying "I eat the lunch".

I learned that almoço and trabalho are verbs meaning "I have lunch" and "I work". Why are they used here?

Both words can be verbs, but they are also nouns meaning "lunch" and "work". You can tell they are nouns in this sentence because they both have words for "the" right in front of them: o almoço (the lunch) and no trabalho (in the work).

Why is it no trabalho instead of em trabalho?