I'm going to tell you about a tiypical cCatalan breakfast.

It is very simple but is delicious.

It's named "pa amb tomàquet" and it is donmade with well baked bread, ripe tomatoes, olive oil and salt.

What do you mean by "well baked"? Is it freshly baked? Toasted (after baking)?

The best and genuinemost authentic bread is named "pa de pagés," and it is a round bread that is cutted in slices, butsliced. However, any other high-quality bread is acceptable too.

You could say the bread is "cut into slices" but it's a bit redundant.

The important poinart is to rub completely the tomato against the bread, and after tothen add the oil and salt to your good taste.

Is the whole sentence the important part, or just rubbing the tomato against the bread? If so:
The important part is to rub the tomato against the bread and then add oil and salt to your taste.

You can also just say "to taste" instead of "to your taste"

Adding crushed tomato is a big mistake andthat you should always avoid.