Caramelized Walnut Tart al'orange

I wanted to use up some walnuts, so I thought about making a pie... I didn't think that I could just make a pecan pie and substitute walnuts since the molasses in the pie has a tannic flavor, which is great when using pecans, but walnuts have that tannic flavor too. I thought it might come out a little "sour". So I opted for a filling based on caramel instead of molasses... Of course, that made me think of Orange caramels, and suddenly Voila!!