Directions

1. Make the lemon-ginger gelatin: Combine water, sugar, and ginger in a small saucepan. Bring to a boil, stirring until sugar dissolves. Remove from heat, and refrigerate for 2 hours. Strain through a fine sieve into a bowl. Whisk with lemon juice. (You should have 4 1/2 to 5 cups liquid. If needed, add more water to yield 5 cups.)
2. Prepare an ice-water bath. Sprinkle gelatin over 3/4 cup cool juice mixture in a small saucepan, and let stand until softened, about 5 minutes. Bring to a simmer over medium-high heat, stirring until gelatin dissolves. Strain into 1 1/4 cups juice mixture in a bowl set in ice-water bath. Let stand, stirring often until mixture begins to gel, 15 to 20 minutes. Pour into a damp 7-cup mold. Refrigerate for 30 minutes.
3. Meanwhile, make the snow: Prepare an ice-water bath. Sprinkle gelatin over 3/4 cup cool juice mixture in a small saucepan, and let stand until softened, about 5 minutes. Bring to a simmer over medium-high heat, stirring until gelatin dissolves. Strain through fine sieve into remaining 2 1/4 cups juice mixture in a bowl set in ice-water bath. Let stand, stirring often until mixture just begins to gel, 5 to 10 minutes.
4. Once mixture begins to gel, whisk together cream and sugar in a bowl until soft peaks form. Fold into gelatin mixture. Spoon into mold on top of lemon-ginger gelatin. Refrigerate until gelatin is set, at least 4 hours or up to overnight. To serve, dip mold in hot water until gelatin loosens, and invert quickly.