You have to use a brand which may be 'cracked'. Chao Koh is one which you can get on-line and maybe elsewhere. I'm not sure if the oil floating on top of a green curry adds to the taste but that's the was it's meant to look. This Thai chef said to me that 90% of cooking is about the way the food looks. If your coconut milk doesn't crack then it's circumvented by the addition of a little oil to the pan before frying the paste. I think that delightful lady in Hot Thai kitchen suggests something similar.
I don't think restaurants in the UK would make their own paste. I spent a few days working in this thai restaurant and they used the brand Nittaya which cam in plastic pouches of varying sizes if I remember correctly. It was more expensive than the others said the chef but better and was less salty so you needed to add more fish sauce. But you have to balance it with sugar too. The didn't have Thai pea or what they call apple aubergines but the western style which was chopped up. In my notes, I've written that the blanch the beg for half a minute before adding to the curry. I've also written that they did the same with the meat which is cut quite thinly so won't take long to cook through. They also added a little evaporated milk right at the end before adding some Thai sweet basil.
I've spoken to this chef on the web who cooks in Canada and she says that outside of Thailand you have to improvise and she also adds broccoli.
I don't think restaurants in the UK would make their own paste. I spent a few days working in this thai restaurant and they used the brand Nittaya which cam in plastic pouches of varying sizes if I remember correctly. It was more expensive than the others said the chef but better and was less salty so you needed to add more fish sauce. But you have to balance it with sugar too. The didn't have Thai pea or what they call apple aubergines but the western style which was chopped up. In my notes, I've written that the blanch the beg for half a minute before adding to the curry. I've also written that they did the same with the meat which is cut quite thinly so won't take long to cook through. They also added a little evaporated milk right at the end before adding some Thai sweet basil.
I've spoken to this chef on the web who cooks in Canada and she says that outside of Thailand you have to improvise and she also adds broccoli.