If you want to tell her gently, you'd better not say anything, because she already knows. If you are still uneasy, you can exaggerate the food you eat a little in your daily life-for example, when you go to grandma's house, grandma cooks a good dish. Every time you taste it, you should praise a few words: "Ah, it's delicious!" "Ah, it smells good!" And so on. Then you will see your mother ask her grandmother for Buddhist scriptures. "How is this dish cooked?" "How do you put the seasoning?" In fact, the overlap between staying at home and living habits is so high that since she can eat the dishes cooked by her mother, she can taste them herself ~