Prepare the dough
For the dough,mix the dry ingredients together until combined,then add ¾ of a cup of warm water and oil and bring together to form a rough dough. Knead for about five minutes until the dough is soft and smooth. Transfer to a slightly warm,greased bowl and cover with a tea towel. Rest in a warm place for at least 30 minutes until the dough has doubled in size. Punch the dough down to remove any air, roll out into a thin circle and place on a large pizza tray.
For topping
Heat the oil in a large frying pan over medium-high heat. Fry the garlic and onion until golden,about three to five minutes. Add the mince and break up with a wooden spoon. Cook until browned,about five minutes. Add the harissa,currants,tomato flesh,sugar,salt and pepper. Cook for a further two minutes,until the tomato has thickened. Set aside to cool.
Top the pizza base with the lamb mixture,then carefully sprinkle the poppy seeds around the edge and lightly press into the crust. Bake in the oven until the base is golden and cooked,about 10 minutes.
Combine the yoghurt,lemon rind and juice in a separate bowl,and season. Scatter the pizza with the herbs and drizzle with the yoghurt dressing to serve.
Adam's tip
Pizza dough freezes well and will keep for up to three months. Roll the dough into individual balls,freeze on a tray,and then store them in press-seal bags. Defrost the balls in the fridge or at room temperature as you need them.