Preheat oven to 400°F.
Make toasts: Trim and discard crusts from bread. Spread 1 side of each slice evenly with butter and season with salt and pepper. Halve slices diagonally to form triangles and arrange, buttered sides up, on a baking sheet. Toast bread, turning once, in middle of oven until golden brown, about 4 minutes. Transfer toasts to a rack to cool.
Make soup: Put squash, cut sides down, in 2 greased shallow baking pans and roast in upper and lower thirds of oven, switching position of pans halfway through roasting, until very tender, about 1 1/4 hours. Cool and scoop out flesh.
Purée squash in batches in a blender with jalapeño, cumin, and broth until very smooth (add additional water as needed to facilitate puréeing).Transfer to a 6- to 8-quart heavy pot and stir in 5 cups water. Simmer, stirring, 10 minutes, then stir in lemon juice, enough water to thin to desired consistency, and salt and pepper to taste.
Serve soup in bowls topped with slices of toast spread with pesto.
Cooks' notes: Toasts may be made 2 days ahead, cooled completely, and kept between layers of paper towels or wax paper in an airtight container at room temperature.
Squash purée may be made 2 days ahead. Cool completely, then chill, covered.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	209.91 Kcal (879 kJ)
Calories from fat	51.97 Kcal
		% Daily Value*
Total Fat	5.77g	9%
Cholesterol	15.25mg	5%
Sodium	392.41mg	16%
Potassium	1285.83mg	27%
Total Carbs	40.98g	14%
Sugars	6.85g	27%
Dietary Fiber	6.83g	27%
Protein	3.5g	7%
Vitamin C	79.6mg	133%
Vitamin A	3.5mg	116%
Iron	3.5mg	19%
Calcium	179.9mg	18%

Amount Per 100 g
Calories	39.93 Kcal (167 kJ)
Calories from fat	9.89 Kcal
		% Daily Value*
Total Fat	1.1g	9%
Cholesterol	2.9mg	5%
Sodium	74.64mg	16%
Potassium	244.59mg	27%
Total Carbs	7.79g	14%
Sugars	1.3g	27%
Dietary Fiber	1.3g	27%
Protein	0.67g	7%
Vitamin C	15.1mg	133%
Vitamin A	0.7mg	116%
Iron	0.7mg	19%
Calcium	34.2mg	18%

* 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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