Salsa: Be sure to use thick and chunky salsa, as opposed to much thinner and runnier regular salsa.
Forming burger patties: We typically advise you to just lightly press your burgers together, as overworking the meat mixture or compacting the patties too firmly can cause your burgers to be tough. However, these burgers have so many ingredients that you do need to be more firm in packing the patties together so they don't fall apart when you flip them. As long as you're relatively firm in shaping them and don't make them too thin, you should be just fine.
Grilling: Remember that grills vary widely in temperature settings, so the settings and times you use may need to be adjusted according to your specific grill.
Make-ahead options: You can combine the spices and wrap the bowl until you're ready to use them, and you can also mix up your creamy salsa dressing ahead of time and keep it, tightly wrapped, in the fridge. You can also prep the slider patties earlier in the day or up to a day ahead and then store them, tightly wrapped in the fridge, until you’re ready to cook them. To prep further ahead of time, you can freeze the uncooked patties and then thaw prior to cooking. These burgers also reheat surprisingly well after cooking, as the salsa keeps them really moist.
Alternate indoor instructions: You can also make these indoors year-round by cooking the burgers over medium heat on a nonstick grill pan or in a skillet, and cooking the polenta under the broiler. The sliders will cook on the first side in about 6-8 minutes in a covered skillet, or 8-10 minutes in an uncovered grill pan. After you've flipped them, continue cooking for about 5 minutes more or until they've reached your desired level of doneness, being careful not to overcook. For the polenta, preheat your broiler as needed. Then, once you've brushed both sides of the polenta rounds with oil and sprinkled them with salt and pepper, broil them for approximately 8-10 minutes on each side, flipping them when they begin to get a bit golden brown.
Slider sandwich option: You can also serve these as slider sandwiches on slider buns, instead of on the polenta rounds. Check the size of your slider buns before you shape the burger patties, though - you may want to make 12 slightly larger burgers (instead of 16), depending on how big the buns are.