How to Make It
In medium non-stick pan, heat 1 tablespoon oil over medium heat; add shallots to pan and cook for 10 minutes or until they are dark golden brown. Add the garlic in the last few minutes of cooking the shallots.
Add the shallots to a high-power blender with sherry vinegar and salt. Blend to incorporate; with the blender running, slowly drizzle in the olive oil to emulsify.