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Put a large ovenproof frying pan over a medium-high heat, and tip in the passata, butter beans, garlic, oregano, spinach and peppers. Stir together and cook for 6-8 mins until the sauce is bubbling and the spinach has wilted. Season, then add the lemon juice.
Heat the grill to high. Scatter the feta over the sauce, so it’s still exposed, drizzle with the olive oil and sprinkle over the lemon zest plus a pinch of oregano, then grind over some black pepper. Grill for 5-8 mins until the feta is golden and crisp at the edges.
Meanwhile, toast the pittas under the grill or in the toaster, then serve with the beans and feta.