Step #1 1 Smash up the garlic with 1 tsp salt in a pestle & mortar (if you don't have one, just finely chop the garlic).
Step #2 2 Place the egg yolk & mustard in a bowl & whisk.
Step #3 Start to add your olive oil bit by bit.
Step #4 Once you've mixed in 1/4 of the olive oil, start adding the rest in larger amounts.
Step #5 3 When you've added it all, you can add the garlic & lemon to taste, & any extra flavours such as basil, fennel tops, dill and sliced roast nuts.
Step #6 To finish, Spice up to taste with salt, black pepper & lemon juice.