In a medium-sized mixing bowl or jar, combine the balsamic vinegar, Dijon mustard, honey (if using), minced garlic, salt, and pepper.
Whisk or stir the ingredients together until fully combined.
Slowly drizzle in the olive oil while whisking continuously to emulsify the mixture. If using a jar, add the olive oil, seal the lid tightly, and shake vigorously until well blended.
Taste and adjust seasoning if needed, adding more salt, pepper, or honey to suit your preference.
Transfer the vinaigrette to a sealed jar or container for storage. Shake or stir before serving if separation occurs.
Notes
Store in the refrigerator for up to one week. Shake well before each use.