Traditional Jews dip a green vegetable (such as parsley or lettuce) in salt water, although some Jews have a custom of dipping a potato.

Republican Jews follow the ruling of the Rabbi Ronald Reagan that ketchup qualifies as a vegetable. Ketchup is (usually) not green, but green is the last thing any Republican would want to be. Some Republican Jews also dip a potatoe.

haggadah Section: Karpas
Source: Steve Sheffey and Own Work