Knead the ingredients for the dough, roll the dough into a ball. Wrap in cling film and put in the refrigerator for half an hour.
In the meantime, finely dice the onion and sweat it in a pan with a little oil, then add the spinach. Mix with the remaining ingredients for the filling in a food processor to a smooth mass. Season to taste with salt and pepper.
Unwrap the dough and roll it out thinly. Cut out 12 circles that are slightly larger than the hollows of a muffin tin. Press the dough into the hollows of the mold and prick several times with a fork. Pre-bake in the oven at 180 ° C top / bottom heat for 10 minutes.
Spread the filling on the dough and finally add half a cherry tomato and a few pine nuts. Bake in the oven at 200 ° C for about 20-30 minutes, until the quiches start to brown on top.