Preheat the oven to 400 degrees F. Line a baking sheet with parchment paper. Lightly flour the work surface and roll out the puff pastry to a 9- by 12-inch even rectangle. Transfer to the prepared baking sheet.

Combine the mascarpone, 1 1/4 teaspoons of the salt, the flour, egg and lemon zest, and then fold in the chives and tarragon. Spread over the puff pastry, leaving a 3/4-inch border. Make small cuts around the border about 1 inch apart with the tip of a paring knife.

Toss the asparagus with the olive oil in a bowl. Lay half of the asparagus in a neat row across the surface of the tart so the tips meet the edge. Do the same in the opposite direction with the remaining asparagus. Season with the remaining 1/4 teaspoon salt and some pepper. Bake until the border of the tart is deep golden and puffed and the top is lightl

In case you are like me and do not keep mascarpone in your frig, here is a good substitute: 4 ounce package cream cheese 1⁄8 cup heavy whipping cream 1 1⁄4 tablespoons sour cream. Makes about 1/4 cup more than you need for this recipe.

Note: In my opinion, the asparagus should be steamed first. They did not cook enough in the tart. Also the tart was a little bland, I would put some lemon juice in the mascarpone mixture. I will try it again. But it looked pretty!