Make the strawberry topping by combining strawberries, sugar, orange liqueur, and orange zest and juice in a large bowl, tossing to combine. Let sit at room temperature for 15 minutes, stirring occasionally, until all sugar is dissolved. Refrigerate, covered, until you're ready to assemble the dessert. Make the whipped cream by combining the heavy cream with the confectioners' sugar in a large bowl and beating with an electric mixer or whisk until slightly thickened. Add vanilla and continue to beat until the mixture nearly forms stiff peaks. Top strawberries with whipped cream and serve immediately. Garnish with chopped toasted pecans.