Preheat oven to 425°F with racks in upper and lower thirds.
Pulse walnuts with bread crumbs in a food processor until nuts are finely chopped (not ground).
Peel potatoes and slice 1/4 inch thick. Divide all vegetables between 2 large 4-sided sheet pans and toss each pan of vegetables with 3 tablespoons oil, 1/2 teaspoon salt, and 1/2 teaspoon pepper.
Roast vegetables, stirring and switching position of pans halfway through, until softened and golden brown in spots, 35 to 40 minutes. Leave oven on with 1 rack in middle.
Add 1/3 cup water to each pan of vegetables and stir and scrape up brown bits from bottom. Chop 1/4 cup fennel fronds. Combine all vegetables in 1 pan and toss with fennel fronds and dill.
Brush baking dish with some of remaining olive oil. Cover stack of phyllo sheets with plastic wrap and a damp kitchen towel. Keeping remaining phyllo covered and working quickly, place 1 sheet on a work surface, then gently brush with some oil and sprinkle with 2 rounded tablespoon walnut mixture. Place another phyllo sheet on top and repeat brushing and sprinkling. Top with a third sheet and brush with oil.
Drape phyllo stack into one half of baking dish, gently pressing it into bottom and up side and leaving an overhang. Make another stack with 3 more phyllo sheets, more oil, and remaining walnut mixture. Drape into other half of dish (phyllo will overlap in center of dish).
Spoon vegetables into phyllo shell. Fold overhang toward center over filling (it will not cover vegetables) and brush edge with oil. Brush remaining 2 sheets of phyllo with remaining oil, tear in half, crumple, and arrange on top of filling.
Bake in middle of oven until phyllo is deep golden brown, 20 to 25 minutes. Cool 5 minutes before serving.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	456.74 Kcal (1912 kJ)
Calories from fat	304.04 Kcal
		% Daily Value*
Total Fat	33.78g	52%
Sodium	81.95mg	3%
Potassium	886.69mg	19%
Total Carbs	36.06g	12%
Sugars	6.48g	26%
Dietary Fiber	7.07g	28%
Protein	5.89g	12%
Vitamin C	32.1mg	54%
Vitamin A	0.3mg	10%
Iron	62.7mg	348%
Calcium	83.6mg	8%

Amount Per 100 g
Calories	154.49 Kcal (647 kJ)
Calories from fat	102.84 Kcal
		% Daily Value*
Total Fat	11.43g	52%
Sodium	27.72mg	3%
Potassium	299.91mg	19%
Total Carbs	12.2g	12%
Sugars	2.19g	26%
Dietary Fiber	2.39g	28%
Protein	1.99g	12%
Vitamin C	10.9mg	54%
Vitamin A	0.1mg	10%
Iron	21.2mg	348%
Calcium	28.3mg	8%

* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.

Tastes

salty
savory
bitter
sweet

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