First make the goat cheese cream by pulsing the cheese, the sour cream and a few drops of water in a blender. Let it sit in the fridge until it's time to assemble the burgers.
In a medium bowl, mix in all the spices, the Brazilian Sofrito and the salt and pepper with the ground lamb, and set aside.
Brush the pineapple slices with some olive oil, and season it with some salt, pepper and a little pinch of cinnamon.
Preheat the grill to 350F, and shape the patties in the meantime.
Grill the pineapples first, and then the patties (unless you're grill is big enough to grill everything at the same time).
Assemble the burgers by spreading the mustard on the buns. Then stack with the lettuce, the patty, the goat cheese cream, the grilled pineapple, and raw red onions.