At the seder, by Korech (the sandwich) we state So did Hillel do. When the Temple was standing he would bind [meat from the} Pesach [offering] Matzah and Marror and eat them as one. As the verse ...
Every seder I've ever been to has used ground horseradish for maror, and "dipping" it in the charoset ends up being implemented as putting both maror and charoset on a piece of matzah and eating that. ...