Preheat your oven to 180°C (350°F). Roll out the shortcrust pastry and press it into a tart pan. Trim the edges and prick the base with a fork. Line with baking paper and fill with baking beans or rice to blind bake. Bake for 10 minutes, then remove the paper and beans and bake for another 5 minutes until lightly golden.
In a mixing bowl, whisk together the eggs, double cream, and milk until smooth. Stir in the grated Parmesan, chopped dill, and spring onions. Season with salt and pepper.
Spread the smoked salmon slices evenly over the pre-baked pastry crust. Pour the egg mixture on top, ensuring it covers the salmon evenly.
Place the quiche in the preheated oven and bake for 25-30 minutes, or until the filling is set and the top is golden.
Let the quiche cool slightly before slicing. Serve warm or at room temperature.
Find it online: https://britishrecipeshub.co.uk/smoked-salmon-quiche/