Egg Salad Tartines With Mixed Herbs

Name: Egg Salad Tartines With Mixed Herbs
Ingredients: 1 large egg yolk; 2 teaspoons Dijon mustard; Kosher salt; 1/4 cup olive oil; 1/4 cup vegetable oil; 4 teaspoons apple cider vinegar; 1/2 teaspoon hot sauce; Freshly ground black pepper; 8 large eggs; Kosher salt, freshly ground pepper; 4 pieces focaccia or slices country-style bread, toasted; 2 scallions, very thinly sliced; 1/4 cup torn basil leaves; 1/4 cup torn dill fronds; 2 tablespoons 1/2-inch pieces chives; 1/2 teaspoon finely grated lemon zest; 1 teaspoon fresh lemon juice; Olive oil (for drizzling)