Try my take of a curry house classic - saag aloo - made with British new potatoes!
Melt thef butter in a frying pan (you can add a little oil to stop it burning)
Gently fry the onion, spices, and the garlic cloves, for roughly 5 mins.
Check the potatoes have begun to soften drain them, and slice so they are about 1cm thick.
Put them into the spice and onion mix to fry for 10mins along with half of your spinach.