Using the food processor with blade attachment on low power, process the egg yolks and herbs for 1 minute. Next, add salt, mustard, lemon juice, and water for 30 seconds.
4 egg yolks* at room temperature, 2 tbsp Provence herbs , 1 tsp kosher salt, 1 tsp lemon juice, 1 tsp dijon mustard, 1 tbsp water