Winter Vegetable Soup with Dumplings
1 onion, finely chopped1 celery stick, finely chopped2 tbsp olive oil600g root vegetables, such as carrots, parsnips, swede, turnips, celeriac and potatoes, sliced or diced150g beetroot (100g peeled and diced, 50g grated)3 garlic cloves, finely chopped1 tsp dried thyme or...