Step 1

Combine the olive oil, garlic, mustard, and balsamic in a sealed glass jar or other container with a good-sealing lid. Add a big pinch of salt and a few grinds of black pepper. Screw on the lid and shake vigorously.

Step 2

Dip a piece of lettuce into the vinaigrette and taste. Adjust the salt, pepper, or the proportion of oil and vinegar to taste.

Step 3

Then, let it sit for anywhere from 1 to 2 hours to let the flavors come together. Don't refrigerate it during this time!

Step 4

Refrigerate after using. The oil and vinegar will separate and harden when chilled. Leave out a few minutes and shake to recombine before using.