Preheat oven to 400 degrees. Unfold puff pastry onto lightly floured board and cut into 9 equal squares. Place on lightly greased baking sheet and bake for 12-15 minutes.
While puff pastry is baking, pour cream into large bowl and start to whip. While whipping, slowly pour cocoa, splenda or sugar, and vanilla into bowl. Scrape sides and continue to whip until stiff peaks form.
To assemble, cut baked puffed pastry in half horizontally. Spoon chocolate cream onto bottom, top with strawberries and then other half of puff pastry. Top with more cream, toasted almonds and chocolate syrup, if desired.