She was right. I never made the complicated recipe but I've made her recipe many times.
This recipe keeps well-if hidden.
Here it is with a few, minor tweaks of my own.
8oz/225g plain flour
1 level teaspoon baking powder
6oz/170g soft brown sugar
5oz/140g margarine or butter
2 tablespoons milk
11/2lb/650g sultanas or other mixture of dried fruit (chop larger fruit such as apricots)
Note-I have sometimes used a 500g packet without problems.
Heat oven to 150 C/300 F /mark 2
Grease a 8"/20cm cake tin and line with paper.
Add the flour, baking powder and sugar to a large mixing bowl, add the butter/margarine, eggs and milk.
Stir until well mixed then add the dried fruit.
Add to cake tin.
Cook for three hours until a skewer comes out clean.
If necessary, cover for the last hour with foil.