Line a baking sheet with a silicone mat or parchment paper.
In a small pot, bring the maple syrup and butter to a boil. Cook for 2 minutes. Add walnuts. Cook, stirring with a wooden spoon, until the sugar crystallizes (becomes grainy) on the nuts. Remove from the heat.
Immediately spoon on the baking sheet. With a spatula, quickly spread the nuts. Season lightly with salt. Let cool completely. Roughly crush with a knife.
In a vinaigrette blender, shake all the ingredients until the dressing is creamy. Season with salt and pepper.
In a bowl of cold water, let the onion soak for 5 minutes to mellow out the flavour. Drain.
In a large bowl, combine the lettuce, apple, and onion. Add dressing to taste and toss well. Sprinkle with the walnuts and bacon.
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Recipes with the "Healthy Pick" stamp have been evaluated by a registered dietitian member of the Ordre professionnel des diététistes du Québec.