Cover a baking tray with parchment or foil, then set a wire rack over it.
Toss 680 g halved tomato with a spoonful of the 40.5 g mustard oil, 4.2 g granulated sugar and salt.
Place the tomato halves cut side down on the rack and roast for 20 minutes, until soft.
Heat the grill to high. Put the tray on the top shelf and grill for 10 minutes, until the tomato skins are charred and partly blackened. Let cool.
Blend half of the roasted tomato until smooth and pour it into a serving bowl. Chop the rest roughly and add it to the bowl.
Warm the rest of the 40.5 g mustard oil in a frying pan over medium heat. Fry 18 g finely chopped garlic for 1 minute. Take the pan off the heat and stir in the chilli powder for the tempering (1.3 g kashmiri chilli powder). Pour this over the chutney.
Scatter over 2 g finely chopped coriander leaf and add salt to taste.
Use 40% to 50% of the fresh tomato weight mixed with a splash of water. Imparts a deeper red colour, thicker sauce, and slightly sweeter cooked flavour.
Use 15% to 20% of the weight (about 1 g for every 5 to 6 g fresh cloves). Whisk into sauces; gives a savoury, toasted garlic flavour without raw pungency.