召し上がれって英語でなんて言うの？

1. You can say this when you serve someone with any dish or beverage you have prepared yourself - especially something which is a little unusual.
2. To be made by your own fair hands = a humorous expression meaning used to say that you have made something yourself:
   "Where did you get this cake?" "I made it with my own fair hands."

Tuck in' and 'Fill your boots' are both informal invitations to eat and enjoy your meal. 'Fill your boots' means eat as much as you like.

Thesre are so many phrases that fit...depending on the context ;-D
From the simple: Enjoy...Tuck in! dive right in! Eat up!
The more sophisticated among you might prefer: "Bon Appetit"
A universally understood phrase for ...Please enjoy the food

Assuming that the person is a friend or relative you can say something more informal like:
Tuck in!
Dive in!
In a more formal situation you can say:
Please help yourself.
Please help yourself to some home made cooking.

You can use any of these expressions :)

Tuck in (informal)
It means to eat food heartily
Can be used when serving food to family and friends

A: This looks delicious
B: Please, tuck in
__

Enjoy the meal
This can be used in formal and informal settings

"Tuck in"/ "Dig in" / "Dive in". Are all ways of telling someone to start eating or start dishing up for themselves. You can also say "help yourself"

"Bon appetit" is a common word used when you start a meal. It means enjoy and start eating.

I hope you like it. It is my homemade bread.' - this is when you want the person to know that you made it yourself or if it is your own recipe.

Enjoy your meal- is the most commonly used expression.