Notes: Serves 8
Strain 1 jar of relish; discard liquid. Pulse 2/3 cup strained relish with onion and garlic in a food processor until finely chopped.
Heat 1 tablespoon oil in a skillet over medium-high heat; add relish mixture. Cook, stirring, until a thick paste forms, about 7 minutes. Stir in soy sauce. Transfer to a bowl; cool 5 minutes. Stir in turkey, Worcestershire, mustard, bread, salt and pepper to taste. Form 8 patties, 4 inches in diameter. Refrigerate, covered, 1-8 hours.
Preheat grill to medium. Brush both sides of burgers with oil, then brush grates. Grill 5 minutes per side until a thermometer inserted into centers registers 165° F.
Combine chili sauce and mayonnaise. Drizzle kale with vinegar and remaining teaspoon oil; season with salt and pepper. Brush cut sides of rolls with butter; grill until lightly toasted. Sandwich burgers in rolls with chili sauce mixture, remaining relish and kale.