Heat oven to 180C/160C fan/gas 4. Line a 22cm tart or flan case with a sheet of baking parchment, pushing it into the sides and leaving a 1cm overhang over the top – this is easiest if you scrunch up the parchment first to make it more pliable (don’t worry about it looking too neat). Grease the parchment with a little oil.
Beat the eggs in a bowl with some seasoning, add the potatoes, smoked salmon and peppers, stir together, then pour into the lined tart case. Spoon blobs of the pesto over the top.
Bake the tortilla for 30 mins until just set and starting to brown. Cool for 5 mins before cutting into wedges, or leave to cool completely and serve cold with salad.