Strawberry Mousse

For Mothering Sunday ( pink Sunday) I made this strawberry mousse.

1 tablespoon lemon juice
1 tablespoon plain gelatin
3 cups frozen strawberries (from a 16-oz. bag), thawed
1 cup sugar
1 cup heavy cream
1. Make mousse: Combine lemon juice and 1 Tbsp. water in a small saucepan. Sprinkle gelatin over and let stand for 10 minutes.
2. In a food processor, blend strawberries and 1/2 cup sugar until smooth. Strain through a fine-mesh sieve into a large bowl; discard solids. Place pan with gelatin over very low heat and warm, stirring to dissolve gelatin. Whisk into strawberry mixture.
3. Using an electric mixer at medium-high speed, beat cream until it forms stiff peaks. With a large flexible spatula, fold 1/3 of whipped cream into strawberry mixture until well combined, then fold in remaining cream until no white streaks remain. Cover with plastic (pressing it onto surface of mousse to prevent a skin from forming) and refrigerate until well chilled, at least 1 hour.