Saute the onion and garlic in oil until soft.

Add the spinach and toss over gentle heat until wilted.

Transfer the mixture to a food processor and pulse until finely chopped.

Add feta and pulse to combine.

Add in enough creme fraiche to make a soft dip and season to taste.

Serve with crostini etc.

Note: To make crostini - pan fry both sides of angle sliced slices of french bread in a little olive oil over a moderate heat until light golden brown, or bake lightly brushed with olive oil, slices of french bread.