You usually learn your family’s dish only after you move out and miss it. Call and ask for the recipe.

The recipes you grew up with are usually in somebody’s hands rather than written down, and the wanting to learn them tends to arrive only once they are out of reach. The urge is about more than the food. What you are missing is a particular kitchen, and cooking the thing yourself brings a surprising amount of it with you.

Ring whoever makes it and ask them to talk you through it while you write. Ask the vague parts twice, since those are where the actual knowledge is. Then cook it badly once, soon, while you can still ask.