If you can, use arugula leaves from the garden or farmers' market; they are more peppery. Nasturtium blossoms and leaves are both edible. The flowers can be found at farmers' markets and specialty-food stores.
These salads make a refreshing starter. To remove the pit
of an avocado without damaging the flesh, halve the avocado
lengthwise, then gently tap the sharp edge of a large knife
into the pit. Twist the knife, holding on to the avocado firmly,
and the pit should come out easily.