1: Slice the onion and sauté in oil until just browning.
2: Add minced garlic and diced chilli, and cook down for another minute.
3: Add in the cannellini beans and their brine.
4: Top up with veg stock and bring to a boil.
5: Let simmer until thick, about 5-10 minutes.
6: Finish by stirring through lots of spinach, lemon juice, and pepper.
