1 1/4cups + 2 tbsp (350g)strained raspberry puree, see note before starting
2 3/4cups (443g)dark bittersweet chocolate chips, 60% cocoa, see note
Instructions
Spray the interior of a 7-inch springform pan with cooking oil spray. Line the bottom with a parchment round. Also line the sides with long strips of cut parchment paper.
Add raspberries to a blender and blend until you have a smooth puree with very little seeds visible. I pureed mine on high for about 1-2 minutes to try to blend as much of the seeds as possible. Pour the puree through a fine mesh strainer to strain out remaining seeds. You should be left with a very smooth raspberry puree with no seeds. Rinse out your blender before reusing. Measure out 1 1/4 cups + 2 tbsp (350 grams) of strained puree and add back to the clean blender.
Add chocolate chips to a microwave safe bowl. Microwave in 30-second intervals, stirring in between with a spatula, until the chocolate is completely melted and smooth. Alternatively, you could do this over low heat in a double boiler on the stove.
Make sure your raspberry puree is room temperature and not cold before adding chocolate. Transfer the melted chocolate to the blender with the raspberry puree. Blend on high speed for a few seconds until you have a smooth, uniform, chocolate batter.
Pour the mixture into the prepared cake pan. You do want to work quickly because the chocolate starts to set soon after it is mixed with the raspberry puree. Smooth the surface with a spatula.
Put in the fridge to set, around 4 hours or overnight. Once cake is set, carefully release it from the cake pan and peel off the parchment paper. If desired, you can frost or decorate the cake with fresh fruit before serving. The frosting I used is in the recipe notes.
Cut the cake with a large sharp knife. I recommend small slices because the cake is very rich. Store uneaten cake in an airtight container in the fridge or freezer.
Notes
Dark chocolate note: Make sure to use dark chocolate chips (sometimes labeled bittersweet chocolate chips) that contain around 60% cocoa. If you need the cake to be dairy-free, make sure to choose dairy-free dark chocolate. Also make sure your dark chocolate chips contain lecithin. Chocolate without lecithin may seize and harden once you add in the raspberry puree.
Raspberry note: Try to choose sweet raspberries, otherwise your cake may be too tart. You will need around 450 grams of raspberries to start with to end up with 350 grams of strained raspberry puree. When blending the raspberries, you do need to blend for 1-2 minutes, or until most of the seeds are blended and no longer visible. If there are still a lot of visible seeds, the puree will be too thick to strain.
Make sure your raspberry puree is not cold when using. If it is cold, it will cause the melted chocolate to seize.
Optional ganache frosting:
1 cup dark chocolate chips
1/2 cup (4 fluid ounces) canned coconut milk or heavy cream (if you don't need the cake to be dairy-free)
Add chocolate chips to a medium bowl and set aside. Heat coconut milk or heavy cream in a small pot or pan over medium low heat. Heat until simmering. Pour hot coconut milk/heavy cream over chocolate chips. Let sit for 60 seconds then gently mix until chocolate is completely melted.
Frost over the surface of the cake. Please note you do not need to use all the frosting.
Estimated nutrition does not include frosting. The servings assumes 12 slices of cake. This cake is very rich so I recommend small slices, around 12-14 per cake.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.