Raspberry Linzer Cookies

Whenever you make raspberry coulis (a purée with the seeds strained out), as for the fromage blanc tart described or the raspberry soufflés, freeze the tiny seeds that won’t go through the strainer and use them to fill your cookies, much like a Fig Newton. (You can also strain a thawed 14-ounce [395 g] package of frozen raspberries just for this recipe and freeze the coulis.) If you don’t want to deal with the seeds, use