Whisk egg whites with pinch of salt until stiff and dry. The liquidy chear egg white texture should be replaced with a foamy texture. Gradually add the sugar, whisking until a thick and glossy meringue is achieved.
Zest the oranges and place the zest in a small bowl. Add the cardamom and stir together till blended evenly.
When the meringue is ready, gently fold in most of the orange zest with the pistachios and chocolate. Save a bit of the zest to sprinkle over all the cookies before they go into the oven.
Proceed to place spoonfuls onto the baking sheets
If you are baking these on a humid day, you may find that the meringue doesn't come together, or that they don't completely cook through, and the insides are still sticky.
If this is the case, thoroughly warm the oven again at 350F, and put the cookies back in, and turn off the oven again. Check after 4 hours.
You could also use chopped dried cranberries or cherries, chopped dried apricots (as long as they are 'fresh' dried), candied ginger, dried apple or pear pieces. Hmmm, fresh chopped thyme and apple would be lovely!
If you opt to use pistachios or almonds etc, then omit the bitters from the above recipe.