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In a medium saucepan, heat olive oil over medium heat. Add couscous and toast for 2-3 minutes. Add broth and salt and bring to a boil. Reduce heat to a simmer, and cook, covered, until water is absorbed, about 10 minutes. Remove from heat and let stand, covered, for 2 – 3 minutes. Fluff gently with a fork, transfer to a bowl and let cool completely.
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When cool, stir in lime zest, lime juice, mint, plums and cherries. Taste and season with more salt if necessary
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In a medium bowl whisk together harissa, honey, garlic, lime zest, lime juice and oil. Add shrimp, salt and pepper and toss thoroughly to combine. Thread onto skewers that have been soaked for at least 30 minutes.
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Grill over medium heat for about 2 minutes per side. Serve over a bed of couscous with additional lime wedges.