If entertaining, brush the pastry lightly with the whisked egg and sprinkle with poppy seeds or sesame seeds. This will produce a really lovely golden finish.
If you want to add more vegetables, add some spinach or grated carrot.
For a meat free option, substitute pumpkin for lamb mince.
NOTE: Lamb mince is often quite oily. You may need to bake these on a cake rack on a baking tray and allow the oil to drip down. Or, turn halfway through, mopping up any excess oil.