Caramelized Onion Meatloaf Sandwiches

• Toss potatoes on a baking sheet with a drizzle of oil, salt, and pepper. • Roast on top rack until browned and tender, 20-25 minutes.

Swap in asparagus for potatoes; roast for 10-12 minutes.

• Meanwhile, in a large bowl, gently combine beef*, panko, garlic powder, stock concentrate, minced onion, half the ketchup, salt (we used ½ tsp; 1 tsp for 4 servings), and pepper. • Form beef mixture into two 1-inch-tall loaves (four loaves for 4); place on a second baking sheet. Brush tops of meatloaves with remaining ketchup. • Roast on middle rack until cooked through, 15-20 minutes.

• While potatoes and meatloaves cook, heat a large drizzle of oil in a large, preferably nonstick, pan over medium-high heat. Add sliced onion and cook, stirring occasionally, until browned and softened, 8-10 minutes. • Add 1 tsp sugar (2 tsp for 4 servings) and a splash of water. Cook, adding more splashes of water as necessary, until onion is caramelized and jammy, 2-3 minutes more. Season with salt and pepper. • Turn off heat; transfer onion to a small bowl. Wipe out pan.

• Heat 1 TBSP butter in same pan over medium heat. Add bread and toast until golden brown, 2-3 minutes per side (add more butter and work in batches as needed). • While bread toasts, in a second small bowl, combine horseradish sauce, mayonnaise, and half the mustard (all for 4 servings). Set aside.