1. Clean the portobellos with a dampened paper towel. Remove the stems and mince them. 2. Lightly coat medium saute pan with a film of olive oil. Add leeks and the minced mushroom stems and saute over medium heat until wilted, about 10 minutes. Add spinach, garlic and dill and season with a VERY light amount of salt (remember, the feta will add more salt later) and pepper. Cook a further 5 minutes. Remove from heat and cool. While cooling make bechamel sauce. 3. Preheat oven to 410F (210C). Oil a pan large enough to hold the mushrooms. 4. Bechamel Sauce: Melt butter in small saucepan over medium-low heat. When melted, add flour and cook, whisking constantly, for 2-3 minutes. If flour looks like it's starting to brown, remove from heat and continue whisking for time stated. Add milk, a dash of salt to taste and nutmeg. Bring to a boil, whisking constantly, and boil for 2 minutes, until thick. 5. Add 4 tblsps of the bechamel sauce to the spinach mixture, along with the beaten egg and the crumbled feta and mix well. 6. Brush the mushrooms with oil and fill the cavities with equal amounts of the spinach filling, flattening the tops of the mounds slightly. Give the bechamel sauce a whisk if it has started to develop a 'crust' and dollop equal amounts of the bechamel over each mushroom (do not worry if the bechamel doesn't dribble down sides at this point - it will during baking). 7. Place mushrooms in bottom third of preheated oven and bake for 30 minutes. The bechamel should start to get brown patches on it - if it's browning too quickly, loosely cover with aluminum foil and continue baking. 8. Enjoy! ---------------------------------------------------------------------------
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