Maris Ayin:

• Meat and milk - pareve dairy or meat, cultured meat;


• Non-kosher and kosher - eggs, restaurants;


• Other issues - Pesach, Shabbos and Yom Tov, tevillas keilim, hafrashas challah.

See seforim by Rabbi Cohen at ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠www.kashrushalacha.com⁠