Leftovers: Warm potato salad

2 tbsp olive oil
1 large onion peeled and sliced
400g cooked leftover potatoes,cut into bite-sized chunks
100ml cre'me fraiche
1 tbsp wholegrain mustard
1 tbsp clear honey
Cook onions in oil untill tender,then add potato's and cook till golden and remove from heat.
Mix together cre'me fraiche,mustard and honey and then mix it into the potato's and serve warm.