Middle Eastern eggs with merguez & pistachios

Name: Middle Eastern eggs with merguez & pistachios
Prep time: 10 min
Cook time: 25 min
Total time: 35 min
Cuisine: Middle Eastern
Ingredients: drizzle of olive or rapeseed oil; 1 small red onion chopped; 4 merguez sausages; 15 cherry tomatoes halved; pinch of sugar (any will do); 2 tsp harissa paste (preferably rose harissa, as it’s fragrant and not too hot); 2 eggs; 2 wholemeal pitta breads; pinch of sumac or paprika (optional); 2 tbsp Greek yogurt; few parsley sprigs, chopped; 1 tbsp shelled pistachio roughly chopped