Preheat oven to 160°C (320°F). Place the butter and sugar in the bowl of a food processor and process until just combined. Add the eggs, almond meal, flour, baking powder and lemon rind and process until just combined. Spoon the mixture into a lightly greased 9.5cm x 33cm loose-bottom fluted tart tin. Place the pears and extra brown sugar in a bowl and toss to coat. Press the pears into the tart mixture and bake for 35–40 minutes or until cooked when tested with a skewer. Sprinkle with raw sugar and allow to cool in the tin. Serve with double cream.