Preheat oven 180°C fan forced. Press the ricotta into a 5cm deep, 9cmx19cm (base) loaf pan lined with baking paper. Combine the oil, chilli, half the thyme and 1 tablespoon honey. Season with salt and pepper. Spoon over the ricotta. Bake 20 minutes or until golden around the edges. Refrigerate 2 hours until firm.
For the crumble; combine the flour and butter in a bowl. Use fingertip to rub butter into the flour until it resembles coarse crumbs. Stir in the sugar and pistachios. Spread onto a lined baking tray. Bake 12-15 minutes until golden. Set aside to cool.
Cut the cheeks from the mangos. Using a large spoon, remove the mango fruit from the cheeks, chop the fruit. Slice the ricotta into pieces. Arrange the mango and ricotta between 4 serving plates. Scatter over the crumble. Combine remaining honey with remaining thyme and drizzle over the crumble. Serve.