Authentic Tanzanian N'Dizi ya na Nyama Recipe with Beef and Plantains

Ingredients

• 1.25 to 1.5 cups of water
• 3 lb (1.36 kg) of lean beef tips, cut into small cubes
• 0.5 tsp of crumbled dried thyme
• salt to taste
• black pepper to taste
• 3 tbsp of vegetable oil
• 1 tsp of chopped garlic
• 2 onions , finely chopped
• 2 ripe tomatoes , diced
• 4 large green plantains , peeled and cubed
• 10 oz (283 g) of freshly shelled green peas
• 1 pt (473 ml) of coconut milk