Couscous—flour coated semolina—is a handy grain, since it is easily prepared and can be combined with many flavours. Look for it in bulk-food stores and in boxes in the supermarket. (Read the preparation instructions, since some types have been precooked.) This salad is an excellent side dish with any grilled food, and a great main dish for a picnic when piled into pita-bread pockets. Pack it in a container for travelling, spoon it into the pita breads when it’s time to eat.
Toss vegetables with garlic, 3 tbsp of the oil, and a little salt and pepper. Arrange vegetables on a preheated barbecue and grill for about 5–10 minutes per side over medium-high heat until tender and lightly browned. Note: a roasted plum tomato is required for the vinaigrette, so grill it at the same time as the other vegetables.
Meanwhile, place couscous in a large bowl, cover with hot stock, and leave for 5 minutes. When all the liquid is absorbed, fluff grains with a fork. Liven flavour with the lemon juice and remaining olive oil.
Cut the vegetables into small pieces and toss with couscous and Grilled Tomato Vinaigrette. Season to taste and scatter cheese and parsley on top.