hamburger with sun dried pesto, garlic pesto, ketchup, trader joe burger sauce, sauteed onions, pepperjack, and pickles

There's this WRONG notion that you can put any darn slice of cheese on a burger. You can't. It has to be American or otherwise emulsified slice of cheese or freshly grated. Anything else will not work and has never worked. The other problem many home grillers have is they don't press the water out because they want it to be juicy. NO! Meat juicyness is actually inversely correlated with moisture. The fat makes the juicy. You want to get as much of the water out as possible.