First, make the tomato confit. In a small but heavy pot, combine the ingredients and heat on medium-low, stirring occasionally, letting the tomatoes soften while you prepare the other components. You can do this up to several hours before you plan to serve, or make a day or two ahead and reheat.
Step 2
Next, make the onion jam. Heat the butter and olive oil in a small saucepan. Add the onions, and season with salt and pepper.
Cook until caramelized, about 15 minutes. Add the honey and wine, and cook on medium-low until the onion has reached a jam-like consistency, about 15 minutes more. Set aside.
Step 3
Heat your grill to medium-high, or heat your oven broiler.
Step 4
When you are ready to cook, shape your patties into rounds, and press an indentation with your thumb into one side. There should now be a shallow “rim” forming the outside of the patty (this helps preserve the burger’s shape while it cooks).
Season the outside generously with salt and pepper right before your burgers hit the grill.
Step 6
Grill (or broil) your burger for 2-4 minutes per side, depending on the thickness of your burger and the intensity of your heat source. Do not press down with a spatula during cooking; this will cause the juice to ooze out rather than keeping your meat moist.
For a pink, medium-rare burger, a meat thermometer will register 135°F (57°C). A well-done burger will register 160°F (71°C). Add cheese during the last minute of cooking.
Step 7
Toast the buns briefly to brown, and assemble your burger, layering with the accouterments you prefer.