Mix the instant mashed potatoes with about ½ cup water. Depending on the brand, may be a bit more or a bit less. You're going for mashed potato consistency, this is used to give "body" to the sauce, so err on the side of caution and go thick, not soupy.
Peel the garlic cloves and put them in your food processor. Add the lemon juice and salt. Puree until finely chopped then stream in the canola oil until it looks like a delicious aoili.
At this point start adding the potato and continue running the food processor until it is all incorporated. Transfer to a covered container.
Now. Before you panic and think you've gone and added too much potato because of course you tasted it immediately and you're disappointed it tastes so potato-ey, put the container in the fridge. Forget all about it for at LEAST a couple of hours, preferable until the next day.
Now you can take it out, take a piece of bread and enjoy every delicious garlicky [and hardly discernably potato-ey] bite.
