How to Make It
In a medium bowl, stir the olive oil with the onion, mustard, lemon juice, capers, parsley. Stir in the jalapeño and Worcestershire sauce and season with salt and pepper. Gently fold in the avocados. Mound the tartare in the center of plates and place a dollop of mustard in the center of each mound. Serve with toasted baguette slices.