Heat oven to 200C/fan 180C/gas 6. Cut the tops off the tomatoes and discard. Scoop out the seeds and discard. Place the tomatoes on a lightly oiled, shallow baking dish.
Brown all the pine nuts in a dry frying pan or under the grill until golden. Wilt the spinach in a hot pan for a min. Drain thoroughly in a sieve, squeezing out the excess liquid, then roughly chop.
Combine the spinach, peppers, 25g/1oz toasted nuts and 125g/41⁄2oz crumbled cheese in a bowl, then season to taste. Divide the mixture between the tomato shells. Top each tomato with more crumbled goat’s cheese and the rest of the pine nuts, then bake for 20 mins until the filling is hot and the tomato skins are beginning to wrinkle and split. Serve warm.