Catalan Vinaigrette - cooking recipe

Ingredients

2 tablespoons red wine vinegar
2 tablespoons hot water
1/2 teaspoon salt (or to taste)
1/2 teaspoon pepper (or to taste)
1/2 cup extra-virgin olive oil
1 large shallot, finely chopped
1 cornichon, finely chopped (or other small sour pickle)
1 plum tomato, finely chopped
1 tablespoon capers, drained and coarsely chopped

Preparation

Combine vinegar, water, salt and pepper in a small bowl.
Whisk until salt is dissolved.
Slowly pour in the oil in a thin, steady stream, whisking constantly.
Whisk in remaining ingredients.
Let stand 10 minutes before using.