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"Protein" is actually a large number of different amino acids, most of which our bodies can manufacture.

Our bodies can't manufacture nine of those amino acids, we have to ingest them, and also in the appropriate amounts.

Eggs have all 9 essential amino acids and also in almost exactly the proportions we need them in, making eggs a fantastic source of protein.

In general, legumes and grains individually are not complete proteins, but are when the two are combined.

Hence rice and lentil dahl, or baked beans on toast. The combination makes complete protein.

> making eggs a fantastic source of protein

Too bad they come in a package with cholesterol and choline.

I'd rather eat beans and whole bread.

Here is what this non-profit that reviews science has to say:

It contains all of the essential amino acids.

Legumes do contain all of the essential amino acids, just not in the ideal ratio. Specifically, I believe they're low in methionine.