Preheat oven to 160C
In a bowl, mix together plain flour, garlic granules, onion granules and black pepper. Coat each piece of oxtail with thee flour mixture.
In a heavy bottomed pan, heat 1 tbsp of oil and brown each piece of oxtail and set aside.
In the same pan, heat 1 tbsp of oil and sautee the garlic, onions and celery until softened.
Add the browned oxtail pieces, tomatoes, carrots, courgettes and any vegetables being used and fry on a medium heat for a couple of minutes.
Add the tinned tomatoes and water and bring to the boil with the lid on. Keep it boiling for about 5 minutes
Place in the pre-heated oven for 2 hrs 30 minutes.
If not preparing for next day, the stew is ready.
Otherwise, remove from oven and allow to cool with lid on overnight at room temperature.
Reheat before serving either on the hob or in the oven at 180C for 45 minutes to an hour.
Serve with cous cous or rice.