Make 8 wholemeal pancakes (use this recipe but use wholemeal flour instead of plain). Preheat the oven to 200°C, fan 180°C, gas 6. Preheat the grill to medium. Grill the bacon for 4-5 minutes until crisp and golden. Drain on kitchen paper and chop into small pieces.
Meanwhile, heat the sunflower oil in a frying pan and fry the onion and garlic for 5-6 minutes until softened. Add the spinach, cover and cook gently for 2-3 minutes until just wilted. Stir in the bacon pieces and season with black pepper.
Divide the spinach mixture between the pancakes, then fold each one into a triangle to enclose the filling.
Transfer to a baking tray and top each with 25g grated cheese. Bake in the oven for 8-10 minutes until the cheese has melted.