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Peel the grapefruit and navel oranges, then peel away the membranes. Drain fruit in a colander and collect any excess juice, then transfer to a serving bowl. Toss in peeled and segmented mandarin oranges.
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Pour excess juice into a small saucepan, and add lime juice, syrup, and cardamom. Bring to a boil, then reduce heat to low and simmer for 10 minutes.
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Allow syrup to cool, then pour it over the fruit mixture and gently toss to coat. Chill. Before serving, garnish with very thinly sliced lemons and a generous sprinkling of ground cinnamon. Use a slotted spoon to serve.
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Adapted from Simply Recipes http://www.simplyrecipes.com/recipes/cardamom_citrus_fruit_salad/