"Baking salmon in a foil packet it a very healthy way of preparing fish, because you don't need to use any fat for the baking process. I season the salmon with an exotic mix of marjoram, lemon, and star anise, but you could use the same method with different herbs and spices."
Preheat the oven to 375 degrees F (190 degrees C).
Heat olive oil in a skillet over medium heat and cook onions until soft and browned, about 10 minutes. Season with marjoram and a little salt. Remove from heat.
Place lemon slices in a single layer in a clean skillet over high heat and cook until lightly browned on both sides, about 3 minutes. Add star anise and water and bring to a boil. Remove from heat.
Cover a baking pan large enough to hold the salmon with sheets of aluminum foil, leaving an overhang on all sides. Lay onions in a single layer on the bottom; place salmon fillet on top, skin-side down. Rub fillet with salt and pepper. Cover with lemon slices and star anise. Fold up the edges of the foil over the salmon to create a packet, making sure to seal the edges well.
Bake in the preheated oven until salmon flakes easily with a fork, 35 to 40 minutes. Remove from oven, open foil carefully, and serve.