Make the black garlic mayo. Mix the mayo with your black garlic paste to your desired smoothness. I like to let a few small pieces of garlic float freely so you get the occasional punch of black garlic in your bites.
1/2 C Mayonnaise, 5-6 Cloves Black Garlic, Mashed Into A Paste
Cover and refrigerate for at least 30 minutes to overnight. Taste for Salt and Pepper.
Salt and Pepper to Taste
If making caramelized onions (again, optional but highly recommended), start them now. Melt 1 Tbsp butter in a wide pan over medium-low heat. Add the onions in with a pinch of salt. Cook for 35 minutes, stirring occasionally, until the onions are soft, deep gold and jammy.
1 Medium Yellow Onion, Sliced Very Thin, 1 Tbsp Butter
Slice your slider buns in half and open them up to toast.
8 Hawaiian or Sweet Slider Buns
Heat a skillet or griddle over medium-high heat.
Melt 1-2 Tbsp butter in the skillet/griddle and then place the slider buns onto the butter, cut side down. Toast to your desired degree and remove.
1-2 Tbsp Butter
Divide the ground beef into 8 portions and shape each portion into patties slightly larger than your buns. Season both sides with salt and pepper just before cooking.
1 Lb 80/20 Ground Beef
Cook in the skillet or griddle for 2-3 minutes on the first side.
Flip the patties to the second side and add the cheese on top (break the cheese into smaller pieces as necessary). Cover the patties while the second side cooks another 2-3 minutes (to help melt the cheese).
4 1 Oz. Slices Swiss, Gruyere or Fontina Cheese
While the patties cook, slather some garlic mayo on the inside of each slider bun (both the bottom and top pieces). Be generous with it.
Once the patties are just cooked through*, Place them on the bottom bun. Top with a spoonful of (optional) caramelized onions, and close them in with the top of the bun.
Serve right away.