Preheat oven to 350°. Grease bottom and sides of 9-inch springform pan. Optional method, grease bottom and line sides with parchment paper (preferred method).
In large bowl, beat sugar and butter on medium until smooth. Add 1 egg at a time and just until blended, then beat for 2 minutes. Scrape bowl as needed.
On low speed, add flour, lemon rind, baking powder, and almond extract. Beat just until blended, do not over mix.
Spread half cake batter on bottom of pan (batter with be thick).
Spread lemon curd evenly onto cake batter, stopping 1/2-inch short of side.
Spoon remaining batter around edge and across top. Spread gently to completely cover lemon curd.
Sprinkle almond slivers over top. Bake for 50 - 55 minutes, or until center is set and cake is golden brown.
Allow to cool in springform pan for 1 hour on wire rack. Center of cake will sink slightly as it cools.
To remove from springform pan, run thin knife along sides before releasing spring. Otherwise, release sides and peel parchment paper off.
Option to sprinkle with 1/2 teaspoon powdered sugar before serving. Store covered in refrigerator. Enjoy!