In a clean medium bowl, beat egg whites until foamy. Add instant coffee, salt and beat until combined. Gradually add 1/4 cup (50 mL) sugar and beat until soft peaks form.
In a separate bowl, whip the cream until soft peaks. Beat in vanilla and 1/2 cup (125 mL) of sugar. Fold cream into egg white mixture.
Fold in 1/4 cup (50 mL) slivered almonds and transfer to a large glass bowl or individual glasses and freeze at least 2 hours.
Garnish with remaining slivered almonds and grated chocolate.