Stewed celeriac with chickpeas and slow roasted tomatoes

Name: Stewed celeriac with chickpeas and slow roasted tomatoes
Ingredients: For the slow roasted tomatoes:; 500 grams cherry tomatoes; 1 tablespoon balsamic vinegar; 4 garlic cloves; 1 teaspoon dried thyme; 1/2 tablespoon sugar; salt, freshly ground pepper; Celeriac and chickpeas; 1 big celeriac, peeled and cut into cubes; 1 ounce can of chickpeas, drained and rinsed; 1 chilli; 2 onions, diced small; 2 garlic cloves, chopped; olive oil; 1 teaspoon harissa; 1 teaspoon mild paprika; 1/2 teaspoon smoked paprika; 1/2 teaspoon turmeric; 1 teaspoon thyme; salt and freshly ground pepper; sage leaves (optional)