For this dessert, the Portuguese kindly accommodate anyone with a gluten intolerance by making a flourless pudding. On the other hand, they made it completely inedible for people with nut allergies, but you can't please everyone. I wish I knew more about the origins of this pudding (apart from it being Portuguese), but I could not find any information about it. I actually think it sounds more reminiscent of English steamed puddings than anything else, particularly since walnuts are a British grown nut. Whatever its history, I'm so glad I discovered Portuguese walnut pudding. It is extremely tasty and light, and uses just three ingredients. Based on the brands I used, each slice should be about 267 calories.