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	436.02 Kcal (1826 kJ)
Calories from fat	302.9 Kcal
		% Daily Value*
Total Fat	33.66g	52%
Sodium	46.7mg	2%
Potassium	780.27mg	17%
Total Carbs	31.54g	11%
Sugars	4.88g	20%
Dietary Fiber	6.03g	24%
Protein	5.2g	10%
Vitamin C	30.3mg	50%
Iron	62.6mg	348%
Calcium	68.6mg	7%

Amount Per 100 g
Calories	161.19 Kcal (675 kJ)
Calories from fat	111.97 Kcal
		% Daily Value*
Total Fat	12.44g	52%
Sodium	17.26mg	2%
Potassium	288.44mg	17%
Total Carbs	11.66g	11%
Sugars	1.8g	20%
Dietary Fiber	2.23g	24%
Protein	1.92g	10%
Vitamin C	11.2mg	50%
Iron	23.1mg	348%
Calcium	25.4mg	7%

* 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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