Basil and Lemon? Sounds great!
take the "cookie" and crumble it up then press it into your tart pan, bake 350 for 10 min just to get the butter to soften and the sugars to stick together, cool, fill with your lemon curd, top with fruits and glaze, set for a few hours in the cooler and there you have it! the curd will meld with your crust and help hold it together.
You could make some sugar coated basil leaves for the top....
YUM
If you want to add more butter like a graham crust, there may be too much butter! Short Bread is Much Richer than a Graham cookie.