Vegetable rösti with smoked salmon and sour cream

Name: Vegetable rösti with smoked salmon and sour cream
Ingredients: 1/2 small kumara (orange sweet potato) (125g), peeled, grated coarsely; 2 shallots (50g), sliced finely; 1 medium silverbeet leaf (swiss chard) (65g), trimmed, shredded; 1 small zucchini (90g), grated coarsely; 1 egg, beaten lightly; 1/3 cup (50g) wholemeal spelt flour; 1 tablespoon olive oil; 120 gram (4 ounces) smoked salmon; 1 1/2 tablespoon light sour cream; 1 tablespoon fresh dill sprigs