The first time Sam made these he used more sugar and a stronger extract; we both agreed it might be nice to try and tone both down, and I think this ratio is spot on. While I’m often nervous about the addition of rose water to desserts as I think it can become overpowering very quickly, it’s so subtle here you will barely notice. I’ve seen bakeries who use a little orange blossom water instead, and that would certainly be nice, too.
To make marzipan: Scoop the almond meal and powdered sugar into the bowl of a stand mixer fitted with the paddle attachment, and mix to break up any lumps. Add the almond extract and rose water and mix to combine. Add the egg white and mix again until it takes on a dough-like consistency. If dry and crumbly still, add a little water, 1/2 teaspoon at a time, until it comes together into more of a dough. Turn the marzipan out onto a clean surface and knead a few times so that it fully comes together and begins to soften into one nice ball. Flatten into a disk, wrap in plastic wrap and refrigerate for 1 hour. Store marzipan wrapped in plastic wrap or waxed paper, refrigerated for up to 2 weeks, or frozen for up to 6 months.
To assemble truffles: Using low, controlled heat, melt the chocolate in a double-boiler, stirring frequently to ensure it melts evenly. Using your favorite truffle mold, dollop a little chocolate in the bottom of each indent and swirl around until the interior is completely covered. Grab a small piece of marzipan and roll it into a ball and then a flat little disk roughly the diameter of your mold. Press the marzipan disk into each of the molds, and then top each with enough chocolate to reach the top of your mold. When finished, place in the refrigerator to cool and firm up (or the freezer if you’re eager like us). If you’d like to top each with a sprinkling of salt, get a small cup of water ready and dip your finger in the water. Moisten the top of each truffle lightly and sprinkle the salt on top — the little wet spots will dry leaving a pretty, salted top.