When the theme for April’s Progressive eats was announced, I imagined myself making a Dacquoise or a Mille-feuille. Having already made the Gateau Opera a few dozen times and enjoyed the Croquembouche challenge with Jenni, I was ready to make a switch and make something else. The decadent Dacqupiose was tempting me. But then I thought, I do need to go out of my comfort zone and make something new and something that showcases the sublime beauty of regional French Cuisine.   I am really proud of the Tarte á l’Oignon – French Onion Tart. You may ask why. After …