This is the real deal Caesar dressing made from scratch -- creamy, tangy, and loaded with umami from anchovy paste and fresh parmesan. No bottled shortcuts. Ready in 10 minutes and miles better than anything from the store.
Egg yolk note: This recipe uses a raw egg yolk, which is traditional for Caesar dressing. If you are concerned about raw eggs, use pasteurized eggs or substitute 1 tablespoon of mayonnaise -- it will still taste great and gives you the same creamy emulsification.
On anchovy paste: Tube anchovy paste is the practical choice here and works perfectly. It dissolves completely into the dressing. If you use whole oil-packed anchovy fillets, mash them into a paste first. Either way, do not skip the anchovies -- they are not optional. You will not taste fish. You will taste depth and savory richness that nothing else replicates.
Parmesan matters: Buy a block and grate it yourself. Pre-grated parmesan has anti-caking agents that affect texture and flavor. A Microplane makes fast work of this.
Oil matters: This is not the recipe to use the cheap stuff. A decent extra virgin olive oil makes a noticeable difference in the final flavor.
If the dressing breaks: Start fresh with a new egg yolk in a clean bowl and slowly whisk the broken dressing into the new yolk. It will usually come back together.