Yes, brill is kosher, a flounder-family flatfish with fins and scales. Its close relative European turbot often isn’t. See how to tell them apart and check any fish.

Yes, butterfish is kosher. It has fins and small cycloid scales per Leviticus 11:9-12. But escolar and oilfish are sometimes sold as “butterfish,” so confirm the species.

Grouper is kosher. It has fins and the removable scales the Torah requires, and OU-cited guidance confirms it. Here’s how to verify it at the market, plus its market names and certification notes.

Kosher for Shabbat means no cooking once Shabbat starts. Food must be fully cooked in advance, then kept warm on a blech, with kosher wine for Kiddush and two loaves of challah.

No, eel is not kosher. Its scales are too embedded in its skin to remove without tearing it, failing the Torah’s fins-and-scales test. Here’s what the OU and cRc say, and how to check any fish.

Yes, yellow croaker is kosher. It has fins and removable scales, the Torah’s test in Leviticus 11:9-12, but Star-K’s Anisakis worm policy restricts unsupervised sourcing.

Yes, plain beer is usually kosher, but the rules just changed. As of 2026 the OU, OK Kosher, and STAR-K require certification on all beer, while the cRc still allows plain beer without one.