Preheat the oven to 225 degrees Celcius. Place the (oven safe) skillet in the oven while it heats.
Meanwhile whisk together eggs and milk until small bubbles start to form on the surface.
Add the salt and flour, little by little and whisk until you have a smooth batter.
Carefully take out the skillet from when oven when it is really hot. Add the butter or olive oil and distribute it evenly over the skillet.
Pour the batter into the skillet and place back in the oven. Let it bake for 15-18 minutes, until puffed and golden brown. Don't open the oven while the pancake is baking, this might cause it to fall together. Don't bake for too long, then it will get dry and boring.
Meanwhile slice the figs and crumble the feta cheese.
When the dutch baby is ready carefully take it out of the oven using a glove or a kitchen towel. Serve immediately with spinach, figs, feta cheese and fiber syrup/honey/agave (if using).