I never really considered myself a 'true' zen practitioner, but years ago I did regular zen retreats. It included sitting meditation, walking meditation, a mindful lunch with other practitioners, and... chores. (Maybe they used a different word - I don't recall.) One time I spent our ~hour washing dishes. Another time, sweeping the zendo.
The point of it, beyond contributing to the greater community, was to do these chores mindfully. There was no higher spirituality to it; just be present. When washing dishes, I was only focusing on washing, rinsing, drying, and putting them away. When sweeping, I was only sweeping the floor to collect dirt. When I collected the dirt, I was only collecting it. And so on. It sounds a bit silly, but it was a tremendous practice to force yourself to only do one thing and to think about that thing while you're doing it.