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Heat oven to 190C/170C fan/gas 5. Put the couscous and raisins in a heatproof bowl. Stir together the stock, honey and lemon juice, then pour over the couscous. Cover and leave to absorb for 5 mins.
Meanwhile, make the gremolata. Place the lemon zest, garlic and parsley in a mini food processor, then whizz until fine (or finely chop everything together). Stir 1 tbsp of this mixture into the yogurt, then set aside. Stir the remaining mixture into the couscous with the tomatoes and some seasoning.
Spoon the couscous mixture into each pepper half, then sit them in a small roasting tin. Drizzle with oil, then bake for 40 mins until the peppers are tender. Serve with the yogurt and a simple green salad on the side.