Gribiche Sauce

Ingredients

• • 1 hard-boiled egg, cold, white and yolk separated
  • 2 tsp (10 ml) Dijon mustard
  • 1 1/2 tsp (7.5 ml) white wine vinegar
  • 1/2 cup (125 ml) olive oil
  • 3 tbsp mixed herbs (such as chervil, tarragon, parsley), finely chopped
  • 1 tbsp sour gherkins, finely chopped
  • 1 tbsp capers, drained and finely chopped