Halloumi and veggie skewers on Israeli couscous

Ingredients

• 8 long wooden skewers
• 6 1/2 tbsp olive oil , divided
• 2 tsp lemon zest
• 1/4 cup lemon juice
• 2 tsp honey
• 1/2 tsp salt
• 1 zucchini , cut into 1/2-in. semi-circles
• 1 bell pepper , cut into 1-in. pieces
• 1 227-g pkg small button mushrooms
• 1 small red onion , finely chopped
• 2 1/2 cups vegetable broth
• 2 cups Israeli or pearl couscous
• 1 250-g pkg halloumi , cut into 1-in. cubes
• 1/4 cup roughly chopped mint