3 tablespoons low-sodium soy sauce
2 tablespoons maple syrup (preferably grade B)
1/4 teaspoon red pepper flakes
1/4 cup plus 2 tablespoons fresh lemon juice(from 2 to 3 lemons)
1 pound skinless, boneless chicken breasts
1 1/2 pounds sweet potatoes (about 2 large)
2 firm apples (such as Cortland or Pink Lady)
1 English cucumber
1 5-ounce package baby kale (about 8 cups)
1 tablespoon sesame seeds
1 tablespoon toasted sesame oil
Kosher salt and freshly ground pepper
1 tablespoon chopped salted peanuts