In a Dutch oven, cook and stir salami in oil over medium-high heat until crisp, 3-5 minutes. Remove to paper towels with a slotted spoon; reserve drippings in pan., Add butter to drippings; heat over medium-high heat. Add Brussels sprouts, kale, onion, salt, cayenne and black pepper; cook and stir until vegetables are crisp-tender. Add garlic; cook 1 minute longer., Stir in the broth; bring to a boil. Reduce heat; cover and cook until Brussels sprouts are tender, 4-5 minutes. Stir in walnuts and vinegar. Serve with salami strips.