Avocados can be expensive, but they aren't too bad at the moment. I found a large one in Lidl for about 80p. Lidl is also currently selling 4 unwaxed lemons for about the same price, though you could use bottled lemon juice if that is cheaper and more available.
serves 4 as an accompaniment
1 large ripe avocado, or two small
juice of half a lemon
1 clove garlic, crushed
pinch of salt and pepper
dash tabasco sauce (optional)
1 large tomato, chopped (optional, but nice, and makes the guacamole go further)
Cut avocado in half and scoop the flesh into a bowl. Immediately mash with the lemon juice to stop discolouration. Mix in garlic and seasoning, and then stir in the tomato.
Serve in a sandwich, or as a dip. (I ate mine with my falafels - fusion food!)
Ideally this should be served immediately, but I covered mine tightly with clingfilm, and it kept quite happily in the fridge for two days.