Vegetable Sambar Stew (Indian Curry)

Name: Vegetable Sambar Stew (Indian Curry)
Prep time: 15 min
Cook time: 40 min
Total time: 55 min
Cuisine: Asian, Indian
Ingredients: 6 tablespoons red lentils, washed; 1 teaspoon turmeric; 1 pinch salt; 2 cups (475g) water; 1 tablespoon vegetable oil (or olive oil); 1 onion, peeled and chopped; 3 cloves of garlic, crushed; 1 inch (2 1/2 cm) piece fresh ginger, peeled and finely grated; 1 large tomato, chopped; 2 teaspoons chilli powder; 2 teaspoons chilli flakes; 2 teaspoons sambar masala powder (or curry powder); 1 teaspoon garam masala; 1 teaspoon fenugreek powder; 1 large potato, diced; 1 carrot, sliced; 1 aubergine (or 2 baby aubergines), diced; 5 cauliflower florets, chopped; 1 inch (2 1/2 cm) slice of white cabbage, chopped; 50g (about 12) green beans, chopped; 2 teaspoons tamarind paste; 1 pinch salt; 1 cup (237g) water; 1 handful fresh coriander