Step 1

Preheat oven to 400 degrees. Prep a parchment paper lined baking sheet and place the defrosted puff pastry sheets on the baking sheet, (if using TWO: overlap them just an inch in order to connect them.) Using a sharp knife, lightly score the pastry dough 1 inch in from the edges all around to mark a rectangle. Then, using a fork, pierce the dough all around in the center, not the edges. Bake the pastry dough until lightly golden, for about 12 to 15 minutes.

Step 2

Remove the pastry shell from the oven, let it sit for a minute or two and then spread on the honey dijon mustard with balsamic vinegar (or dijon mustard if that's what you have) and then sprinkle on the Gruyere cheese.

Step 3

*Trim the bottoms of the asparagus spears to fit crosswise inside the tart shell. Arrange them in a single layer over the Gruyere cheese, alternating ends and tips. Sprinkle on the peas if using. Brush or lightly drizzle with olive oil, and season with salt and pepper.

Step 4

Bake until the spears are tender, for about 20 to 25 minutes. Watch your tart while in the oven! Remove from oven and let cool for a few minutes. Add additional toppings like the lemon zest to brighten the tart and some balsamic glaze if desired. Slice and serve and enjoy!