Candy the Walnuts: In a skillet, melt butter over medium heat. Add maple syrup, harissa paste, and a pinch of salt. Stir to combine, then add chopped walnuts. Cook for about 3-5 minutes, stirring frequently until the walnuts are golden and fragrant. Remove from heat and let cool.
Prepare the Dressing: In a small mason jar combine white wine vinegar, olive oil, maple syrup, mayonnaise, and sea salt and shake well. Pour half of the dressing into a shallow bowl for dipping.
Note: This vinaigrette recipe makes double the amount you'll need for the endive boats, and you will not use all of the smaller endive leaves. Feel free to use the extra dressing to enjoy a side salad, so that the smaller endive leaves aren’t wasted.
Slice the Pear and Crumble the Cheese: Thinly slice a pear and crumble blue cheese.
Assemble the Endive Boats: Cut the ends off Belgian endive and carefully separate the leaves. Choose the larger leaves and set aside the smaller leaves. Dip each leaf in the dressing, allowing excess to drip off. Place a slice of pear at the bottom of each endive leaf, then top with candied walnuts, crumbled blue cheese, and a few strips of basil.
Serve: Arrange the assembled endive boats on a round plate and drizzle with an additional spoonful of dressing and serve immediately.