This hot hors d’oeuvre is typical of what is served in small restaurants throughout Provence. It’s delicious as it is, but I find the tarragon adds just the right element to make it memorable.
Bring a large pot of water to a boil, add the zucchini, and cook until slightly tender, about 8 minutes. Remove the zucchini, but leave the water boiling. Cut the zucchini into 1½-inch-thick slices. Once they are cool, remove the center portion with a melon baller, making sure you don’t break through the bottom. Salt the boiling water abundantly and cook the shrimp until