Pick the most fragrant edible roses in your garden and separate the petals. Select the largest well-shaped petals. Snip out the yellow, triangular part of each petal, as this can taste bitter. Put the petals on a small tray lined with baking paper.
Use a paintbrush to brush one side of each petal with the egg white and sprinkle with caster sugar. Leave to harden for a few hours, then tu