French Caramelized Onion Tart

Ingredients

• 1 1/2 cups whole wheat flour
• 1 1/2 teaspoons salt, divided
• 1/2 cup unsalted butter (preferably oil-based), cold, diced
• 1/4 cup cold water
• 2 1/2 tablespoons olive oil, divided
• 2 pounds sweet onions, sliced thin
• 2 teaspoons sugar
• 1/4 cup sherry, vegetable broth or water
• 1/4 pound asparagus spears, trimmed and cut into 2" lengths
• 1/4 cup pitted nicoise olives

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