Most Ouzo is made from a base spirit of grapes before being flavored with anise. Is Ouzo kosher without certification if it is made from a base spirit of grapes? Is Ouzo kosher without certification if the base spirit is made from grain?
If base is from grain it’s fine.
If base is from grape, it can be a problem.
You would need to find out if it’s cooked before the grapes and the juice are separated, also if maybe the grape juice component is less than 1/6th of the final product. We would need more info.