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Preheat oven to 350F/177C. Grease and line with nonstick paper a baking sheet.
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In a pan, heat up butter and olive oil, sauté garlic and white onion. Add in blanched spinach leaves. Pour white win and let it reduce. Set aside to cool.
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Prepare the pastry: Combine the flour, and salt in a bowl. Cut in butter and shortening until mixture resembles coarse crumbs. Add water, a tablespoon at a time, enough to form a ball of dough. Rest the dough in a covered bowl.
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In a bowl, season the salmon fillet with salt, freshly crushed black pepper, and the two mustards.
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Roll out pastry dough, brush the inside with the marinate of the salmon. Lay spinach leaves at the bottom then place seasoned salmon fillet, cover with more spinach leaves.
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Fold over the pastry to cover the filling. Seal with egg wash. Score the pastry as desired. Bake in the oven of 30-35 minutes.
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Serve.