Place enough water in the bottom of a 4-quart saucepan to come 1 inch up the sides. Bring to a simmer over medium heat.

Place the chocolate chips and liqueur in a medium metal mixing bowl, set over the simmering water, and stir with a rubber or silicone spatula until melted. Remove from the heat and stir in the vanilla extract.

Combine the tofu, chocolate mixture, and honey in a blender or food processor and spin until smooth (about 1 minute).

Pour the filling into the crust and refrigerate for 2 hours, or until the filling sets firm.