Juicy tender ribeye topped with chimichurri, caramelized onions, Havarti cheese and arugula on a toasty ciabatta bun is the ultimate steak sandwich. Grill or pan sear the ribeye steaks, depending on the weather and serve this yummy sandwich year round.
Add all chimichurri ingredients to a food processor or blender and pulse a few times until chunky but blended. Set aside until needed
Caramelized Onions
Heat a large skillet over low heat. Drizzle a small amount of oil into the pan then add onions. Let onions cook undisturbed for several minutes. Give them a stir every 3-5 minutes during the cooking process until brown and soft. Add salt and pepper then remove from heat
Steak Sandwich
Preheat oven to 400°F. Heat a large skillet over medium - high heat until very hot. Add a drizzle of olive oil, season one side of each ribeye then place seasoned side down in pan. Let cook undisturbed for 2 minutes. Season other side of ribeyes during this time. Flip steak over and cook an additional 2 minutes. Remove from heat onto a cutting board
Let the steaks rest for 5-10 minutes. During this time place sliced ciabatta facing up on a sheet tray. Add sliced cheese to one side of the bread. Pop it in the oven for 3-5 minutes until cheese is melted and bread is toasted
Remove from oven then add mayo, steak, flaky sea salt, caramelized onions, chimichurri and arugula
Notes
Chimichurri can be made up to 1 week in advance and stored in the fridge in an airtight container. Bring to room temperature before serving to liquify oil. Do not salt the caramelized onions until they are finished cooking. Be patient with them and leave the heat at low-medium. Generously season steaks. You may have a little leftover salt and pepper mix. Cook ribeye to medium rare. Use a digital meat thermometer to take temperature in the center of the ribeye steak. Remove the steak from the heat at 120°F then let it rest for 5-10 minutes before slicing.