Watercress. What to do with it? [View all]

So I was at an Asian grocery store, and they had bunches of green herby things in bags, and it turns out I inadvertantly bought 3 bunches of watercress (thinking it may be some sort of basil or mint, which I was actually looking for, and got).

My current purpose is in a Thai red curry. But, i tasted the watercress and it was somewhat bitterish. What do people use it for?

The upside to the trip was I got several bags of unknown but interesting tasting herbs, that I have yet to identify.

But wondering what to do with 3 bunches of watercress? TIA