Peel the garlic cloves and slice lengthways, then place in a large non-stick frying pan on a high heat with 1 tablespoon of olive oil, stirring regularly. Slice each chicken breast lengthways into 3 strips, then toss with a pinch of sea salt and black pepper. Once the garlic is nicely golden, quickly remove from the pan with a slotted spoon, leaving the flavoured oil behind. Go in with the chicken and cook for 5 minutes, or until golden and cooked through, turning regularly.
Remove the chicken from the pan and tip in the chickpeas (juices and all). Add the spinach, along with most of the garlic and 1 tablespoon of red wine vinegar, then toss over the heat until the spinach has wilted and the chickpeas are hot through. Season to perfection with salt and pepper, then return the chicken to the pan and finish with the reserved garlic and a generous dusting of sumac.
