Meanings of fine colander in English

When they are done, peel them and pass them through a fine colander.

Boil the spinach and pass it through a fine colander.

Boil the spinach for a few moments, drain, squeeze out the water, then pound it well, and pass it through a fine colander.

Crush it thoroughly with pestle or potato-masher to free the pulp from the tough outside coating; rub through a fine colander, then through a sieve.