Almond extract or bourbon are great complimentary flavors with apricots. I like to use either one with this cake or a combination of both instead of vanilla.
This recipe is adapted from Nigella Lawson’s Strawberry Sour Cream Streusel Cake.
Make a slurry with the almond extract, lemon juice, and cornstarch then add to the blender or your container. Purée until smooth. Taste the purée and if it seems too bitter, add a smidgen pinch of Kosher salt. Taste again then set aside. The flavors will balance out when added to the cake.
In a large bowl add the flour, sugar, baking powder and baking soda. Use a small whisk and stir the mixture until evenly incorporated. Add the butter and use your fingers to smoosh the butter and mix in with the flour mixture. Do this until your flour looks like coarse sand, just like making a pie crust by hand. Measure a ½ cup (125 ml) of the flour mixture and add to a small bowl. Reserve for the streusel topping.
Add just over half the batter to the prepared pan and spread over the bottom and up the sides of the pan. You want to create a flat bottom well for the purée to rest. Try to get the batter about an inch up the sides. Do not worry about making the bottom level even. The batter is sticky, and I found wet hands helps move the cake batter into position.
Bake the cake until it is light golden brown, about 45 minutes. Insert a toothpick in the center of the cake to make sure it is cooked through. You will see some crumbs on the toothpick, but nothing should look wet or raw.
In the original recipe, Nigella added 2 teaspoons of vanilla extract to the fruit purée. I divided the liquid between the almond extract and lemon juice. Almond extract is strong, so I do not recommend using 2 teaspoons in the recipe. However, I have used anywhere from 1/2 tsp up to 1 tsp with good results. Feel free to divide the lemon juice and almond extract equally, or only use lemon juice. However, keep the total liquid at 2 teaspoons.
I peeled off the skin of my apricots, but I will leave that decision to your discretion. Apricot skins do not have that fuzzy offensive texture of peach skin, so I do not believe it is necessary to peel them. The apricots peels will purée thoroughly in a blender or with an immersion blender.
If you cannot get fresh apricots, use canned apricots packaged in their own juices as a substitute. Dry off the can juices from the apricots then weigh or guesstimate by size pairing the halves to make 5 apricots for the purée. There is no need to peel canned apricots.
Minced candied ginger is a nice addition to the streusel topping. Don’t go overboard with the candied ginger as the apricot is the star of the cake. Nutmeg is another spice that pairs well with this cake. Add about a half teaspoon of freshly grated nutmeg in the cake batter to complement the apricots and almond flavor.