Preheat the oven to 200C/gas mark 6. Wash and halve the radishes, toss in the oil and put on a baking tray in the oven for 10-15 minutes. For the last 5 minutes, put the hazelnuts in the oven on a separate tray.
Peel and slice the oranges with a sharp knife. Put the oranges and all the juice from the chopping board in a bowl.
Add the radishes, hazelnuts, mint, cumin and plenty of salt. Taste to see if it needs more oil, or perhaps a squeeze of lemon.