Dialog window with dynamic content

For a catering company I have a listing with the differerent menus. From each menu I only show 5 items. At the bottom of each li tag I have a read more button. What I want is when the button of a certain menu is clicked that a modal window opens up with the complete menu. So I need to pass the menu_id to the function that controls the modal window. Does anyone know of a good example or even an tutorial. Thank you in advance!

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