Step 1

Stir butter, miso, chile, and ginger in a small bowl until smooth.

Step 2

Heat a large skillet, preferably cast iron, over medium-high. Toss beans with oil in a medium bowl, then add to skillet. Cook, tossing occasionally, until charred in spots and crisp-tender, about 4 minutes.

Step 3

Spread miso butter on a platter. Arrange beans over. Top with sesame seeds, then squeeze lime wedges over.