Heat oven to 225 degrees F. Line a baking sheet with parchment paper.
Beat the egg whites to a stiff froth, 2 minutes, then very slowly add the
sugar and rose water, beating hard until soft peaks form with a glossy sheen,
3 to 5 minutes.
Fill a piping bag fitted with a large star tip with the sugar mixture and
carefully pipe 1 1/2-inch circles on the baking sheet, spacing them 1 inch apart.
Bake until lightly browned, 35 minutes, then turn the oven off and let the
cakes sit for 45 minutes.
Remove the baking sheet from the oven and carefully
remove the cakes from the parchment paper.
Spread the flat side of 1 cake with about 1/2 teaspoon of the jam, then
press the flat side of another cake against it, making a ball-shaped morsel.
Repeat with the remaining cakes and jam.
Yield: about 46 cakes
* Rose water is sold at Indian markets and some specialty markets.