1- 1 1/ 2 pounds boneless steak such as ribeye filet, sirloin
2- neutral oil as needed
3- kosher salt to taste
4- freshly cracked black pepper to taste
5- 3 sweet onions thinly sliced
6- 9 slider buns
7- 3/ 4 pound sliced havarti cheese
8- 1 stick unsalted butter at room temperature
9- 4 garlic cloves minced
10- 1/ 2 lemon zested and juiced