1 egg yolk
1 to 2 cloves garlic, minced
1 tablespoon lemon juice
1/2 teaspoon salt
1/2 to 3/4 cup olive oil
Optional: 1 teaspoon Dijon mustard
Whisk the egg yolk, garlic, lemon juice, salt, and Dijon mustard if using
Add the olive oil very slowly while whisking constantly
Continue whisking until thick and creamy
Adjust with more lemon juice or salt if needed
Serve immediately or chill until ready to use