Add lemon juice, vinegar, sugar, dijon mustard, diced shallot and the minced roasted garlic clove (from above) to the bowl of tomato juice. Whisk to combine.
1/2 shallot, finely diced, 1 tbsp lemon juice, freshly squeezed, 2 tbsp vinegar (red wine or light balsamic), 1 tsp dijon mustard, 1 tsp brown sugar