Savoury cakes are very popular in France; they appear in boulangeries and with a side salad on lunch menus in chic cafes, but they're most likely to appear at a picnic. They are super-simple to make and can be adapted to use whatever leftovers you have in your fridge--just follow the basic batter recipe and get creative with the fillings!
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In a separate bowl, whisk the eggs until fluffy and pale in colour. Then gradually whisk in the oil, milk and yoghurt. Add the salt and black pepper. Fold the flour mixture into the whisked eggs. Try not to over-beat as this will make the end result tough (it's better to under-mix). Pour the batter into the prepared tin.