Rub and wash the potatoes, then put them in a pan of water. Bring it to the boil. Cook for about 10-15 minutes until tender, then drain and keep the potatoes warm.
Meanwhile, peel and thinly slice the garlic cloves. Slice the chilli too (remove the seeds and veins if you don’t want it spicy).
Rinse the spinach under running water, then drain.
Heat the oil in a large frying pan and fry the garlic and chilli for a few seconds. Add the spinach and lemon juice. Put a lid on, turn down the heat, and let it steam.
Meanwhile cut the potatoes into bite-sized pieces.
When the spinach has wilted, add the potatoes and the lemon zest. Season to taste with salt and pepper. Combine everything together.
Serve warm.