Maple Mustard Vinaigrette

I made a delicious Maple-Bourbon grilled pork loin to slice & serve on top of salad, & I was looking for a dressing that would go well with it. This is it! It would make a great dipping sauce for chicken as well & it helped to cut the bitter flavor of some of my greens, which had begun to bolt before they were picked.

1/3 c maple syrup
2 T chopped spring onions (you could use shallots or chives, too)
3 T Grey Poupon
3 T vinegar (I used Traditional 18-year Aged Balsamic from The Olive Twist, but their Fig Balsamic would be amazing, too.)
1 T olive oil (I used Arbequina from The Olive Twist)
1/4 t pepper
1/8 t salt (I don't add this, but some of us thought it needed it)