Prepare the grainy mustard vinaigrette: To a small bowl, add the olive oil, mustard, vinegar, maple syrup, lemon juice, and garlic. Season with kosher salt and ground black pepper to taste. Whisk to combine well, until the mixture emulsifies into a smooth and creamy vinaigrette. Adjust seasoning to taste.

Storage: This mustard vinaigrette will keep, stored in an airtight container in the refrigerator, for up to 5 days. If the vinaigrette separates and solidifies in the refrigerator, simply warm it slightly in the microwave until it’s liquid again, then whisk to combine well and serve as desired.