Preheat the oven to 200℃ fan/220℃/Gas Mark 7/390F.
Place the spinach in a colander, either in the sink or in a large bowl, then pour over a full kettle of boiling water, making sure all the spinach has turned dark green and wilted. Run the spinach under a cold tap and when cool enough to handle use your hands to squeeze as much of the water out as possible.
Roughly chop the spinach and mix together with the cream cheese in a bowl, the zest of the whole lemon and the juice of half of it. Season with salt and pepper and set to one side.
Pat the salmon dry with some kitchen roll and turn one piece over so it’s flat side up. Spread the cream cheese and spinach mixture over the top, then place the second piece of salmon on top, flat side down.
Unroll the pastry, leaving it on the baking paper it comes on and give it a little extra roll to make it slightly wider.
Place the salmon onto one end of the pastry, making sure there’s a 2 cm border around the three closest sides, then brush the edges with egg and fold the rest of the pastry over. Use a fork to seal.
Brush all the pastry with the rest of the beaten egg, then cut a small ‘X’ into the top (this helps any steam escape.)
Trim off any excess baking paper, then carefully slide the en croute onto a baking tray and bake for 35-40 minutes until the pastry is golden and the salmon cooked through. Leave the Salmon en Croûte to rest for 10 minutes before slicing and serving.
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Calories: 600kcal | Carbohydrates: 28g | Protein: 41g | Fat: 36g | Saturated Fat: 9g | Polyunsaturated Fat: 7g | Monounsaturated Fat: 16g | Trans Fat: 0.003g | Cholesterol: 132mg | Sodium: 333mg | Potassium: 1112mg | Fiber: 2g | Sugar: 2g | Vitamin A: 3371IU | Vitamin C: 11mg | Calcium: 100mg | Iron: 4mg