The Orthodox Union
It should have kosher-certification.
As with most products, grape products require kosher certification. If they do not have proper certification, they should not be considered Kosher.
Anything that has a kosher certification on it.
It's a kosher certification agency.
Yes - If you look at the can, you will see the letter "U" with a circle around it. This is one of the symbols attached toproducts to indicate that it is Kosher.
It can be, check the package for kosher certification.
The "OU" on food packaging (the letter U inside a circle) is the kosher symbol of the Union of Orthodox Jewish Congregations of Amertica (Orthodox Union), one of the first nationwide kosher certification efforts in the USA. It is still one of the most popular and widely accepted kosher symbols in the United States. Many Orthodox Jews who only eat kosher food will only buy products with this symbol. The "OU" by itself indicates that the product in the package is kosher. Additional marks to the side of the 'OU' will indicate other details as required, including 'Dairy', 'Meat', 'Fish', 'Pareve' and 'Passover'.
That means it was certified by the Circle K Kashrut board, and the D means it's Kosher Dairy. This certification applies to Sephardi and Ashkenazi Jews.
It needs to be cooked in a kosher vessel and have kosher ingredients. If purchased, it (or the bakery) should have kosher-certification.
The answer is that it really depends on if the product has a kosher certification, or not.
Capers can be kosher, they require a valid kashrut hechsher (symbol of kosher certification).
It can be. You'd have to check the packaging for kosher certification.