Bring the blue cheese, cream cheese and crème fraîche out of the fridge for half an hour or so to come to room temperature if mixing by hand.
Add all the ingredients to a bowl (or use a food processor) and mix well with a fork until evenly combined.
Season to taste with salt and freshly cracked black pepper. If you think it needs more lemon juice, feel free to add more.
Keep in the fridge for several days covered with cling wrap.
