Having made a double portion of the CTM sauce i posted here,
http://www.curry-recipes.co.uk/curry/index.php?topic=4314.msg39324;topicseen#msg39324i had enough left over for another meal.
The butchers around here are nearly all kurdish and so lamb/mutton is the preferred meat. They have some interesting cuts that i've been sampling. Lamb ribs are a thing of beauty and only need roasting, but preferably cooking over coals or a BBQ. I find the testicles (AKA lamb fries or lamb eggs) similar to sweetbreads (thyroid gland or pancreas) in that they're very tender and a 'squishy' consistency while being only mildly lamb flavoured. I threw together a quick rub which consisted of tandoori curry powder, kashmiri chilli powder, lemon and reclaimed oil and then grilled them under an electric radiating grill on metal skewers. As with nearly all meat i dont think they need to be fully cooked. I've never overcooked them but i guess they're dry out and firm up if you did.
Next time with more prep time i would marinade them for longer and use blade's tikka recipe. That way they'd have more flavour.
If you havent tried balls i recommend them

. They're cheap and easy to prepare. You just need to rip the skin off (which a butcher should do) and wash them really. You dont need to stew them for ages to get them tender, they're like that already! And no they dont taste creamy or of chlorine

My girlfriend didnt share my enthusiasm though. She was surprised as she thought i was cooking chicken and she doesnt like lamb anyway. She was almost sick but it was the consistency that bothered her rather than the flavour. She's just said it was a bit like marshmallow, which i think is a positive comment!
I forgot to take an initial photo so this is one i found on t'interweb
Nearly finished cooking
The red things are sliced chillies
Bollock tikka masala with chillies and coconut, done.