Ewan McGregor and I ate a lot of strange things on our motorcycle journey around the world, but the strangest had to be a meal we had in Mongolia. It was a stew of 200 testicles. It had been castration day, and there were sheep, bulls', goats', even camels' parts.

The thing about Mongolia is that it's incredibly difficult to grow vegetables there, so mostly we ate muttony stews. This was different. Ewan managed to eat his, but it was a small one - from a sheep, I think. Mine was about twice the size, from a bull, maybe. It was gristly with a pop to it - they must be hollow once cooked. I tried to eat it but it just came back up.

So for this recipe I've tried to make it more palatable, by turning it into a curry.

6tbsp vegetable oil
2 onions, chopped
4 cloves garlic, chopped
1 inch piece of ginger, chopped
1tsp chilli powder
1tsp garam masala
1tsp turmeric
1tsp cumin
A pinch of salt
Black pepper
2tbsp tomato purée
600g mixed testicles (or lamb, if you prefer)
One small tub of double cream
One small tub of crème fraîche

Heat the oil in a pan, add the spices, garlic ginger, salt and pepper and stir for a few minutes for the flavours to come out. Add the onion and fry until brown. Add the testicles and fry for five minutes or so. Finally, turn down the heat, add both tubs of cream and cook for five minutes until it thickens. Serve with boiled rice.

'The Long Way Round' double DVD (£18.99) and CD soundtrack (£8.99) are out Monday