Place about 1/2-teaspoon strawberry preserves in bottom of each tart shell; set aside.
In a medium bowl, combine mascarpone cheese, Limoncello or lemonade and lemon juice. Beat at medium speed with an electric mixer until creamy.
In a medium bowl combine cream, sugar and lemon extract. Beat at medium-high speed with an electric mixer until medium peaks form. Fold into mascarpone mixture, stirring until combined.
Spoon about 1 tablespoon mascarpone mixture into each tart shell. Top each with a strawberry half.