Lass es dir schmecken.
Guten Appetit!
enjoy your meal
The dictionary form/infinitive is "geniessen," and if you mean it as a command e.g. "enjoy [your meal]" it would be "geniesst" to a group of friends or "geniessen Sie" to strangers; however, if you are looking for what to say at the start of a meal, Germans simply say "guten Appetit" (bon appetit, or good apptite).
In italy you should say 'Bon Appetit' (Enjoy Your Meal)
You could borrow the French and say "bon apetit", or say "Enjoy your meal." It literally means "good benefit".
"Enjoy your meal" is "appréciez votre repas" in French. A standard formula is "bon appétit".
In Dutch, you say "Eet smakelijk" to wish someone to enjoy their meal. This phrase is commonly used before meals in Dutch-speaking countries. It conveys a warm sentiment, similar to "Bon appétit" in French or "Enjoy your meal" in English.
In Indonesian, "enjoy your meal" is expressed as "selamat makan." This phrase is commonly used to wish someone a good meal before they start eating. You can also say "selamat menikmati" if you want to emphasize enjoying the food.
There isn't a language called Mexican.
Приятного аппетита Priyatnogo appetita
enjoy your meal
buon appetito
We say "Bon appétit"