Heat oven to 190C/170C fan/gas 5.
Split each pitta horizontally into two circles, then cut each into 6 triangles.
Lay them in a single layer, rough side up, on 2 or 3 baking sheets.
Use a pastry brush to brush the pitta triangles with olive oil, then sprinkle with fennel seeds and a pinch of sea salt.
Bake for 10-15 mins, until golden.
Leave to cool on the tray.