Rhubarb & Chard (& Mustard Seeds & Sausage)

Okay, so it’s not exactly “Hey, you got your chocolate in my peanut butter!” territory, but it’s close. Over high heat, the rhubarb breaks down quickly, dissolving into a sauce that slicks the dark, tannic greens; those tannins—and the rhubarb’s citrusy tang—work to balance the rich sausage; the mustard seeds weigh in with a little pop of…