As with most products, grape products require kosher certification. If they do not have proper certification, they should not be considered Kosher.
Grapes, as a fruit, are kosher. However, grape products have additional rules specific to grapes due to the religious significance of the fruit.
Wine produced by gentiles is not kosher.
The label has to say "Kosher for Passover"
Kosher wine or kosher grape juice
products that have Rabbinical supervision to ensure their kosher status.
Yes, grape seed oil is kosher for Passover for all groups including Ashkenazim. You would have to check the labeling for a valid Pesach hechsher though.
They currently have 7 kosher products.
No, Butterball products are not kosher.
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No, but there are kosher companies that make spices. Just look for the kosher symbols on the products.
Usually, provided that it contains nothing but fruit and sugar. If it contains grape juice, carmine, or gelatin it's probably not kosher.
No, it is not.