Position a rack in the center of your oven and preheat to 400°F.
In a medium bowl, combine lemon juice, water, olive oil, and salt. Whisk together to combine, and set aside.
Arrange salmon fillets in a 9x15 inch baking dish. **(see notes) Cut 2 shallow holes on the surface of each fillet on the thicker end of the salmon. Take care not to cut through to the bottom of the salmon. Insert half a garlic clove into each hole so it's embedded within the meat.
Pour the lemon juice mixture on top of the fillets. Sprinkle each fillet with granulated sugar (which helps yield better browning on the fillets!) and black pepper.
Bake the salmon in your preheated 400°F oven for 15 to 20 minutes, or until the salmon is golden on top and cooked through. If needed, broil for about 1 to 2 minutes on low at the end of the cooking time to caramelize and brown the top.
Take the salmon out of the oven, and serve plain or garnished with lemon slices and parsley.