Preheat your oven to 180℃/350F Fan, 200℃/400F or Gas Mark 6.
Boil or microwave your potatoes (in their skins) for about 10 minutes to just soften.
Drain your potatoes and slice your potatoes and courgettes into approx 0.5 cm slices (or use a mandolin if you have one).
Now cut a piece of foil that is big enough to create a parcel to hold your food, You need enough excess to wrap across the top of the ingredients.
Spray of brush the foil with a little olive oil. Arrange the slices of partially cooked potato on the foil, overlapping them to fill the dish. Lay slices of courgette on top.
Once all of the courgette has been used up, place the 4 salmon fillets on top, followed by a slice of lemon on each. Sprinkle with the fresh thyme, crushed garlic and a drizzle of oil.
Season with salt and pepper.
Wrap the foil over the top of the salmon. Cook for 20 minutes.
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