Red lentil and tomato soup

This is one of my favourite soups. I know it doesn´t fit in with the whole summer thing, but what do you know? July in Aberdeen is very much like the most blustery October Madrid can throw at one.
It´s very simple, thick and creamy, a properly bolstering soup that will fill and warm you up without being heavy. And, need I say, in a pressure cooker it takes very little time to cook. So put this one away for autum, and thank me later.

Quantities can vary without spoiling the result, but this is the usual:

Chop an onion and a clove of garlic, add some cumin seeds and leave them to soften while you peel a couple of carrots. Throw them in, coarsely chopped, followed by a half kilo tin of whole plum tomatoes with their juice. Fill the empty can with water, add that, and a cup of red lentils. You might want to throw in a stock cube.
Leave it to simmer until the lentils are cooked, about half an hour, or ten minutes in a pressure cooker.
Puree with a blender and taste. It will probably need salt, a dash of butter, some sherry and certainly the juice of half a lemon. Garam masala is a very good adition, if you have some around.