Step 1Using a mortar and pestle, finely grind the tarragon, oregano and bay leaf. Add the garlic and grind. Add the anchovy and work the mixture until the anchovy is ground and mixed with the other flavorings. Remove the mixture to a large bowl.
Step 2Add the egg to the bowl and beat the mixture well with a whisk to combine. Beat in the mustard, lemon juice and Worcestershire. Slowly drizzle in the oil, whisking constantly to emulsify the dressing.
Step 3Whisk in the red wine and balsamic vinegars, then season with salt and pepper. Taste, adjusting the seasonings and flavorings as desired. This makes a scant three cups dressing, which will keep, covered and refrigerated, 3 to 5 days.