Step #1 Saute the onion & garlic in oil until soft.
Step #2 Add the spinach & toss over gentle heat until wilted.
Step #3 Transfer the mixture to a food processor/blender & pulse until finely sliced.
Step #4 Add feta & pulse to mix.
Step #5 Add in enough creme fraiche to make a soft dip & season to taste.
Step #6 Serve with crostini etc.
Step #7 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.