Preheat oven to 425. (I always use 500 and watch the pizza carefully).
Mix the lamb with the harissa and salt and pepper. Heat a large non-stick skillet over high heat and add the lamb. Break up the clumps with a wooden spoon and cook until browned - about 5 minutes.
Divide the 2 cups of mozzarella, lamb, and provolone between the pizzas. Cook for 15 minutes (start checking at 10, especially if doing the higher 500).
Combine the parsley, lemon zest, toasted pine nuts, baby spinach leaves and the olive oil and lemon juice. Notice there are no measurements here other than the lemon juice and olive oil. I just used about a ¾ bag of spinach and about ½ cup of parsley leaves. Just use your own judgement, you can't mess it up! Scatter on top of the pizza.