I like the organic Kallo stock cubes too, Thompson, if I need a lighter stock. And your stock recipe is right up my alley. Here's a cheat's secret: add a Kallo cube to your stock pot. The stock comes out even richer! I never add brassica trimmings to stock.

If I want stock for something like a slow-cooked pot roast, I'll use one Kallo beef cube to 500ml water, I'll soak a handful of dried porcini in 300ml boiled water for 20 minutes and use the liquor from that (look out for the last drop which can be gritty), and I'll boil a glass of red wine in a small saucepan and set fire to it to burn off the alcohol. Mix that lot together and you have a super stock. You can chop up the porcini and chuck that in the pot too. Why not.