In a large bowl, add 1 large onion, peeled, halved and sliced, 1/2 teaspoon garlic ginger paste, 1 teaspoon coriander seeds, 1/2 teaspoon cumin powder, 1/2 teaspoon garam masala, 1/2 teaspoon Kashmiri red chilli powder, 1/4 teaspoon turmeric, 1/2 teaspoon dried fenugreek leaves (methi), 1/2 teaspoon sea salt, 1 small handful fresh coriander leaves and 1 teaspoon fresh lemon juice or lemon dressing in a large bowl. Mix well and set aside for 1 hour.