Preheat the oven to 200°C.
Scrub and wipe the potatoes clean, then cut them into bite-sized chunks.
Scatter them in a baking tray, season with salt & pepper, then drizzle with oil.
Put the tray in the oven and bake for 10 minutes, then toss the potatoes and bake for another ten minutes.
Cut the lemon into 4 pieces.
Turn down the oven temperature to 180C.
Take the tray out of the oven and scatter the tomatoes and lemon pieces around the potatoes, dust with the spices then toss well.
Bake for 10 minutes, then add the broad beans and toss again.
Bake for another 5-10 minutes until golden.
Serve with chopped parsley scattered on top.