Place the pitted cherries, 1/4 cup granulated sugar, and lemon juice in a medium saucepan and set over medium heat. Cook, stirring occasionally, until the cherries soften and release their juices and the sugar dissolves, 5 to 7 minutes.
In a small bowl, whisk the cornstarch and cold water until smooth. Slowly pour the slurry into the simmering cherry mixture while stirring constantly. Continue to cook for 1 to 2 minutes, stirring, until the cherry compote thickens and lightly coats the back of a spoon.
Remove the saucepan from the heat and stir in 2 tablespoons Almond Extract fruit juice concentrate. Transfer the cherry compote to a bowl and let it cool completely to room temperature, then refrigerate briefly if needed until chilled.
Prepare a bain-marie by bringing 1 to 2 inches of water to a gentle simmer in a medium saucepan. In a heatproof bowl that fits over the pan without touching the water, whisk together the egg yolks and 1/2 cup granulated sugar.
Place the bowl over the simmering water and whisk constantly until the mixture becomes pale, thickened, and slightly warm to the touch, 5 to 7 minutes. Remove the bowl from the heat and let the egg yolk mixture cool to lukewarm.
Add the cold mascarpone cheese to the cooled egg yolk mixture and whisk or beat with an electric mixer on low until smooth and fully combined, without overmixing.
In a separate large bowl, add the cold heavy whipping cream and vanilla bean paste. Using an electric mixer, beat on medium-high speed until stiff peaks form and the cream holds its shape.
Gently fold the whipped cream into the mascarpone mixture in 2 to 3 additions using a spatula, folding just until the mixture is smooth, light, and airy.
In a shallow dish, stir together the cooled brewed coffee or espresso and 1/4 cup Almond Extract fruit juice concentrate until well combined.
Quickly dip each ladyfinger, one at a time, into the coffee mixture, turning to coat lightly. Do not soak; a fast in-and-out dunk is enough. Arrange a single snug layer of dipped ladyfingers in the bottom of a 9x13-inch dish.
Spread half of the mascarpone cream mixture evenly over the layer of ladyfingers, smoothing the top with an offset spatula.
Spoon half of the cooled cherry compote over the mascarpone layer in dollops and gently swirl it slightly into the cream with the back of a spoon.
Repeat the dipping process with the remaining ladyfingers to create a second layer over the cherry-swirled cream.
Spread the remaining mascarpone cream evenly over the second layer of ladyfingers. Dollop the remaining cherry compote on top and lightly swirl it into the cream.
Cover the dish tightly with plastic wrap and refrigerate for at least 4 hours, or up to overnight, until the tiramisu is fully chilled and the layers are set.
Just before serving, dust the top generously with unsweetened cocoa powder using a fine-mesh sieve and garnish with fresh cherries or chocolate shavings if desired. Slice and serve cold.