For the caramelized onions: Add the butter to a medium skillet over medium-low heat. Add the onions and cook, undisturbed, until the bottoms of the onions begin to caramelize, 10 to 15 minutes. Stir once, then cook for another 5 minutes, undisturbed, until golden. Deglaze with the sherry. Season with salt and pepper and set aside.
For the patty melts: Heat a large cast-iron skillet over medium-high heat. Form the meat into 4 balls with your hands. Season both sides with the garlic salt and some pepper. Smash to the desired size (matching up with the size of your bread). Griddle each side until crusty, very seared and about medium/medium rare in the interior (about 130 degrees F), 5 to 6 minutes a side. Thoroughly wipe clean the skillet and reduce the heat to medium low.
On each of 4 slices of rye, place 2 slices of cheese, then a patty, then some onions, then 2 more slices of cheese and finally another slice of rye. Butter both sides of each sandwich (crust to crust is a must) and griddle until the bread is slightly golden and the cheese is gooey, 2 to 3 minutes per side (dome with a metal bowl if necessary to ensure the cheese melts). Serve with your favorite yellow mustard if desired.
Tools You May Need
Tools You May Need
Price and stock may change after publish date, and we may make money off
these links.
By entering your email address, you agree to our Terms of Use
and acknowledge the Privacy Policy.
Food Network and
its affiliates
may use your email address to provide updates, ads, and offers.
To withdraw your consent or learn more about your rights, see the
Privacy Policy.