Fruit of your choice, optional (I love it with berries!)
Butter a round 9 to 10 inch spring-form pan, and cover the bottom of the pan with parchment paper.
Preheat the oven to 350 degrees.
Place the almond and sugar into a food processor. Pulse until finely ground. Crack the eggs on top of the mixture. Pulse until well combined. Stir in the vanilla extract and Porto wine, if you will use it. Drop in the butter chunks, and process until smooth and thoroughly combined.
Pour the batter into the cake pan. Place on a rack in the middle of the oven and bake for 30 minutes. The top will be nicely tanned, the cake will feel springy to the touch and a toothpick should come out clean if inserted in the cake.
Remove from the oven and let the cake cool for 10 to 15 minutes. Unmold the cake, invert onto a platter and remove the parchment paper. Invert the cake again onto another platter to have the top of the cake right side up.
In a small saucepan, mix the apricot glaze with the lime juice. Set over medium heat and simmer for a couple minutes, just until it dissolves.
With a brush, spread the apricot glaze on the outer circumference, about 1 to 2 inches in depth, on the top of the cake. Sprinkle the glazed area with the toasted almonds. You may serve the cake with whipped cream on the side, or on the top of the cake. Any fruit of your choice will be lovely too!