Vegan 'Tuna' Mayo + Roasted Sweet Potato

Ingredients

• 3-4 small/medium sweet potatoes
• 1 1/2 cup cooked chickpeas (equivalent of a 400 g can), roughly mashed
• 1 large or 2 small spring onions, finely chopped
• 1 medium/large celery rib, finely chopped
• 3-4 tbsp vegan mayonnaise
• 1 tbsp grainy mustard
• 1 tbsp apple cider vinegar
• 1 tbsp nutritional yeast
• Sea salt and black pepper, to taste