French Vinaigrette

Ingredients

• 1 anchovy
• 1 small garlic clove
• Salt
• Juice from half of a nice fresh lemon
• 1 teaspoon Dijon mustard
• ¼ cup olive oil, something good but not too fancy
• Freshly ground black pepper or small pinch piment d'espelette

Directions

1. Mash the anchovy, garlic, and a pinch of salt to a paste. 
2. Squeeze in the lemon juice and stir to break up the anchovy paste. 
3. Beat in the mustard. 
4. Either beat or whisk in the olive oil, a few glugs at a time. The vinaigrette should emulsify but will never become super tight and even, and that's ok. 
5. Season with the pepper or chilis. 
6. Wash some sturdy or bitter greens, and you're on your way to salad paradise.

Source
http://joannagoddard.blogspot.com/2012/06/best-french-vinaigrette-youll-ever-have.html