1. Preheat grill to 400°F and coat grates with oil. In large bowl, combine ground sirloin and chuck until just combined. Form into 4 equal patties, and season both sides with salt and pepper.
2. Grill for 4 minutes, flip and cook additional 4 to 6 minutes, until cooked to desired. With about 2 minutes remaining on cook time, add 2 slices of Swiss cheese to each patty.
3. Meanwhile, combine all ingredients for peppercorn aioli in small food processor and process for 2 minutes, until well-blended and slightly foamy.
4. Spread peppercorn aioli on both sides of buns. Top each bottom bun with layer of arugula and burger patty. Top with fried onions and top bun and serve.
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Directions
1. Preheat grill to 400°F and coat grates with oil. In large bowl, combine ground sirloin and chuck until just combined. Form into 4 equal patties, and season both sides with salt and pepper.
2. Grill for 4 minutes, flip and cook additional 4 to 6 minutes, until cooked to desired. With about 2 minutes remaining on cook time, add 2 slices of Swiss cheese to each patty.
3. Meanwhile, combine all ingredients for peppercorn aioli in small food processor and process for 2 minutes, until well-blended and slightly foamy.
4. Spread peppercorn aioli on both sides of buns. Top each bottom bun with layer of arugula and burger patty. Top with fried onions and top bun and serve.