To make spicy tomato
sauce, heat 1 tsp oil in a non-stick pan, add red chilli, tomatoes and salt and cook on low heat. Add vinegar and ½ tsp black pepper powder and mix and continue to cook.
Meanwhile to make
aioli, combine egg yolk, garlic, salt and lemon juice in a dry, clean bowl. Whisk well. Add 2 tbsps of olive / veg oil and whisk, till it mixes completely with the other ingredients. (It is important for the oil to mix completely or the mixture may split). Add remaining oil and whisk continuously. Add ¼ tsp black pepper powder and mix. Transfer into a serving bowl.
Add 2 -3 tbsps water
to the tomato sauce and mix and cook on low heat till it achieves sauce consistency. Transfer into another bowl.
Heat sufficient oil in
another non-stick pan, add potato cubes and shallow-fry till they turn golden brown. Drain on absorbent paper. Sprinkle salt over them.