How to Make It
Spray 2 rimmed baking sheets with cooking spray. Trim stems from rainbow chard and reserve for another use. Divide chard leaves and sliced shallots evenly between prepared pans; lightly coat vegetables with cooking spray. Broil on high, 1 pan at a time, until partially charred, 4 to 5 minutes.
Chop chard into large pieces. Place chard mixture on a platter. Top with golden raisins, extra-virgin olive oil, fresh lemon juice, kosher salt, and black pepper.