Put the beans, olive oil, tahini, cumin, salt, garlic and the juice of 1/2 lemon in a blender, mini chopper or similar.Blend until well combined.
Taste and adjust with more lemon juice and a little more salt if needed - and adjust the consistency with a little more oil, or a splash of cold water, if necessary.Blend again until your hummus is smooth and creamy.
Spoon your hummus into a bowl and, if you like, top with a drizzle of olive oil, a few fresh herbs and a sprinkle of freshly ground pepper.