Sauté the onion in the oil for 5 mins, then add the carrot and mushrooms and cook for a further 5 mins.
Now add the lentils and three quarters of the stock.
Blend the mashed red kidney beans in the remaining stock, add these to the pan with the nuts, shoyu, lemon juice and seasonings. Cook everything, well mixed together, for a further 10-15 mins.
Then add the oatmeal, reduce the heat and simmer gently for 15-20 mins, adding a little extra liquid if necessary.
Turn the mixture into a lightly oiled 1lb loaf tin and bake for 30 mins.
Serve with mashed neeps and tatties.
Notes
If you don't have any red lentils in the cupboard you could always use green instead.