Cut the limes and squeeze the juice into a glass, removing the seeds.

In a blender, combine the two cans of milk and the juice from 7 limes.

Blend for 1 minute and 30 seconds.

Spread a small amount of the mixture in a baking dish to help the cookies stick and not move.

Place a layer of María cookies in the dish.

Add a layer of the mixture.

Repeat steps 5 and 6 until the mixture is used up.

Refrigerate for one hour.