Option: use a 9-inch square baking dish instead of a tart pan. The prep time calls for 4-6 hours to soak the walnuts but you can do this overnight and leave the walnuts soaking longer.
Ingredients
2 cups raw walnuts
2 cups packed pitted and roughly chopped dates
10 tablespoons unsweetened cocoa powder
1 tablespoon pure vanilla extract
2 tablespoons crushed pistachios
Instructions
Soak walnuts in cold water for 4-6 hours (or overnight)
Line a 9-inch tart pan with unbleached baking parchment paper
Drain and place walnuts in a food processor and pulse until chopped
Add dates and pulse to chop stopping frequently to scrape down the sides
Add cocoa powder, vanilla and process until mixture is almost smooth and scraping down the sides as needed to keep mixture moving (the mixture will form a ball similar to a dough with small pieces of walnuts and dates
Transfer chocolate dough to tart pan and press evenly with wet fingers
Chill for 2-4 hours
Sprinkle chopped pistachios
Transfer tart to plate or cut slices in place
Sprinkle with crushed pistachios and serve
Store in refrigerator until ready to serve
Adapted slightly from Raw Fudge recipe card at local Boston Whole Foods
Recipe by Kitchen to Nirvana at https://kitchentonirvana.com/2013/04/23/raw-chocolate-tart/