Make the vinaigrette by adding the ingredients to a high sided container and blend with an immersion blender. Taste for seasoning and sweetness (if you want it sweeter, add a bit more maple syrup). Note: alternatively, you can blend everything in a food processor, but it won't get it as emulsified and smooth.
1/3 cup olive oil, ¼ cup red wine vinegar, 1 medium shallot, 1 1/2 tbsp maple syrup, 1 tbsp spicy brown mustard, 1/2 tsp salt, 1/4 tsp cracked black pepper