Make your pastry following the recipe (see recipe list), but use a mini-muffin tin and reduce the cooking time to 10 minutes with the weights on and 5 minutes with them removed.
For the kumera filling, preheat the oven to 160 degrees Celsius.
Place the kumera and tomatoes in a lightly oiled roasting tin and sprinkle with the chervil. Season with sea salt and roast for 35 minutes. Fill half the pastry cases with the mixture.
For the leek filling, heat the oil in a large, heavy-based saucepan and saute the leeks over a low heat for 15 minutes. They will reduce considerably in volume and become very soft and sweet. Let them cool, then put a little in each of the remaining pastry cases, topping with a couple of olive quarters and a small amount of goat's cheese.
Gently heat the tartlets in a 150 degree oven for a few minutes before serving.