Begin by making the poached pear and rhubarb compote. Preheat the oven to 200°C/Fan 180ºC/Gas 6. Line a roasting tray with baking paper. Combine all the compote ingredients (except the yoghurt or labneh) in the roasting tray and cover with kitchen foil. Bake in the preheated oven for 10 minutes, then remove the foil and bake for a further 10 minutes. (If your pears are particularly hard and unripe, you may want to bake them for an extra 10 minutes before adding the rhubarb.)
Remove the roasting tray from the oven and allow to cool while you make the crumble. Combine the pistachio crumble ingredients in a small mixing bowl. Set aside. To serve, place the compote into 2 breakfast bowls, top with a dollop of yoghurt or labneh and then sprinkle with the pistachio crumble.