Olive oil, cashews, macadamia! Google crushed bulk macadamia u can buy it buy the sack load! Chuck a 4-5 cups of quality nuts with a few tablespoons of olive oil in blender with some eggwhites (u can buy these by the litre for around 4$ a pop in australia, 1L = 180mg protein ) maybe a tablespoon or 2 of peanutbutter and mix up a days worth of smoothie! With a combo like this ur lookin at around 1600-2000 caloris a litre! This is just a base mate u can add fruit.. Sugar.. More fats less fats.. And ur favourite flavours for a wicked mix! The amount of calories per litre usually relies on how weak ur stomach is! And how good ur blender is! Can add enough nuts to make a 3000 calorie oer litre smoothie but normally these are too hard to scoff! Much like eating peanut butter from a jar. Also adding cream to prevent things going too thick adds a shit load of calories! This is obviously s bulkinh smoothie i wouldnt recommend it if ur looking for lean gains