1.Melt butter in large saucepan; cook onion and garlic, stirring, until onion softens. Add potato, stock and the water; bring to a boil. Reduce heat; simmer, covered, about 15 minutes or until potato is tender. Stir in spinach; cool 15 minutes.
2.Meanwhile, to make lemon feta toasts, preheat grill. Combine feta with 1 teaspoon finely grated lemon rind. Cut bread stick into 1.5cm slices; discard end pieces. Toast slices one side; turn, sprinkle each slice with feta mixture and another 1 teaspoon finely grated lemon rind. Grill toasts until browned lightly.
3.Blend or process soup, in batches, until smooth. Return soup to same cleaned pan, add cream; stir over medium heat until hot.
4.Serve bowls of soup with toasts.
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