Double-Crusted Custard Tart

Suzy David has two versions of this delicate tart in The Sephardic Kosher Kitchen. The word inchusa refers to a tart, sometimes with a single crust, sometimes with a double crust. Given the changeable nature of recipe names, I was not surprised to find encusa, used for a spinach gratin. One bite of this tart, however, and you will know that this is a classic Spanish dessert. Lacking a shallow tart pan you may use a 9-inch pie pan. In that case, you may not need all of t