Step 1

Heat grill on medium. In small bowl, combine onion and lemon juice. Let sit, tossing occasionally.

Step 2

In large bowl, toss sweet potatoes with 2 tablespoons oil and 1/4 teaspoon each salt and pepper. Grill until slightly charred and tender, 4 to 5 minutes per side.

Step 3

Into bowl with onions, stir lemon zest, chile, hemp (if using), and remaining tablespoon oil, then stir in mint. Makes 1/2 cup relish.

Step 4

Spread Greek yogurt (if using) onto a platter and drizzle with oil. Arrange sweet potatoes over yogurt and spoon mint relish on top.