Make the tuna salad. In a medium mixing bowl, combine the tuna, eggs, jalapenos, celery, green onions, and olives. Season with a big pinch of salt, pepper, and red pepper flakes.
Dress and serve. Pour 1/2 cup of the Dijon Vinaigrette all over the tuna salad. Toss gently until well combined. Taste and adjust seasoning to your liking. If you need to, add more of the vinaigrette and toss again. Garnish with the parsley and serve, on whole grain bread or lettuce wraps if you’d like.