Lemon Custard

Ingredients

• 1/2 teaspoon lemon zest
• 2 tablespoons sugar, divided
• 1/2 cup all-purpose flour
• 5 egg yolks
• 1/4 cup butter, cut into small pieces
• 1/4 teaspoon salt
• 1/8 teaspoon salt
• 1 rosemary sprig
• 1/2 cup whipping cream
• 3 tablespoons cornstarch
• 1/2 tablespoon butter
• 1/3 cup sugar
• 3 tablespoons lemon juice
• 1 tablespoon lemon zest
• 1 cup whole milk