Dorie Greenspan's Mustard Tart | Saveur

Ingredients

• 1 ¹⁄₄ cups all-purpose flour, plus more
• 1 tsp. sugar
• ¹⁄₂ tsp. kosher salt, plus more
• 6 tbsp. unsalted butter, cubed and chilled
• 4 eggs
• 1 tsp. ice-cold water
• 1 large carrot, peeled and trimmed
• 1 large leek, white and light green part only, trimmed
• 2 sprigs rosemary
• 6 tbsp. creme fraiche
• 2 tbsp. Dijon mustard
• 2 tbsp. whole grain mustard
• freshly ground white pepper