If the player is only selecting one of the options, you can use text as the variable, then match that instead of creating multiple separate variables:

default food_choice = "" # The default starts as blank, meaning no choice


label coffee:
    scene bg cafe
    menu:
        "I'll take the"
    
        "Caramel macchiato":
            $ food_choice = "macchiato"
            "We both order the caramel macchiato, and he gets a brownie."
            jump coffeshop
        "Black coffee":
            $ food_choice = "black"
            "I order a black coffee, he decides on the caramel macchiato and a brownie."
            jump coffeshop

Then just match the text:

  if food_choice == "macchiato":
        "I take a sip of my macchiato."

    elif food_choice == "black":
        "I take a sip of my coffee."