Don't stop reading yet! The name isn't exactly inspiring, but these brownies are really, really good!
Dan explains in his Guardian column.
They aren't totally suitable for the low saturated fat diet which CT is following, but they certainly make a great treat for him, without overloading on butter. They are really aimed at someone trying to cut down their calorie intake, particularly from excessive fat and the empty calories from sugar.
This is a more fiddly recipe than usual, as I had to plan ahead and bake a sweet potato. I did this in the oven, as I wasn't sure if a microwaved potato would be the same - I assumed the potato would lose some moisture as it cooked in the oven, but might not lose as much in the m/wave. I started with a potato weighing around 400g and used about 2/3 of it in the recipe. The only change I made to the recipe was to use toasted hazelnuts instead of pecans, so that FB could eat the brownies.
After following the recipe exactly, I found it took a few minutes longer than stated to cook the tray of brownie batter - it was liquid in the centre at 25 minutes, but by 30 minutes I was worried that it was overcooked, as it seemed so solid. So the correct end point is something to watch for closely.
These will be made again, but only as an occasional treat for CT - he needs to stick to the oil based cakes.