Is Ouzo Kosher?

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.

The Hashgaha for Ouzo 12 is from the London Beis Din and I believe other bate din in Greece - again, no Hashagah stamp on the label though.

Kasher lePesah?

Metaxa brand can be found with a ‘Hashgaha stamp’ and ‘Ouzo 12’, according to what I read, is Kasher without a ‘Hashgaha stamp’ on the label.

My question is whether or not they are Kasher for Pesah?

It would be difficult to say, as we would need to know percentages