What is the best oil-to-vinegar ratio?
The classic ratio is 3 parts oil to 1 part vinegar. If you like a sharper dressing, go 2 to 1. If your vinegar is strongly flavored or especially sharp (like red wine or sherry vinegar), start at 3 to 1 and adjust from there. If you are using a sweeter vinegar (like balsamic), you may want a little less sweetener.
How do I keep oil and vinegar from separating?
You cannot stop it forever, but you can make it behave. Use Dijon mustard (or a little mayo), whisk while slowly streaming in the oil, and shake right before serving.
Can I make it without mustard?
Yes. It will separate faster, but it still tastes great. Add an extra pinch of salt and whisk well. A small spoon of honey can help the dressing feel a bit more cohesive (more body), but it is not a true emulsifier.
Why does my dressing taste flat?
Usually it needs one of three things: more salt, a touch of sweetness, or freshness (a squeeze of lemon or a tiny splash more vinegar). Add in small increments, taste, repeat.
Is this the same as Italian dressing?
It is the base of it. Add dried oregano, basil, a pinch of red pepper flakes, and a little grated Parmesan and you are basically in Italian dressing territory.
How do I make it vegan or sugar-free?
Vegan: use maple syrup instead of honey. Sugar-free: skip the sweetener and add a little extra Dijon or a tablespoon of finely minced shallot to round it out.