What else can we do with mustard greens?

I brought some mustard greens home from the supermarket last week in the hopes of making something with them myself instead of only relying on the packaged pickled mustard greens I like to get at the Asian grocery and serve on white rice.

The ideas tried so far:
1. sauteed mustard greens with turkey kielbasa slices and onions, served over leftover colcannon
2. more mustard greens and the kielbasa/greens leftovers in a curried potato soup
3. raw mustard greens on sandwich of corned beef on rye
4. bell pepper, zucchini and shredded mustard greens stir fry with sweet soy sauce and fresh ginger

All these applications of mustard greens were delicious, and my husband was downright shocked at the difference in spiciness between the very mild and limp cooked greens and the raw greens on his sandwich, which were as peppery as nasturtiums.

In five minutes of poking around on the Internet, I've found recipes that treat the mustard green much like greens of other sorts:
1. just like collard greens with pot liquor
2. just like sauteed kale with garlic and chile flakes
3. just like bok choy, stir-fried and braised and served with soy sauce and sesame oil
4. as part of a mixed salad, especially baby greens

With their frilly edges and bright, spring-green color, the mustard greens available here are just begging me to use them more often with less cooking time. Perhaps blanched and simply dressed as a wilted salad, or tossed into a pot of beans at the last minute so they don't lose their peppery bite.