London Bars by My Mum This recipe is quite old, and I have kept it in my book for years. By the way, I adore this dessert, it is wonderful, mixed with the flavors of walnut jam and good dough. Phenomenal. My mom always makes it on New Year's Eve or Christmas, especially for her grandchildren. I recommend the recipe to anyone who likes a good bite. Follow recipe. Ingredients: baking tray 20x20 cm, simple, total time: 60 min. The Crust: 100 g of butter 200 g of flour 3 egg yolk