What Can I Make with Potato and Tomato?

These two are close relatives — both are nightshades, both were carried out of the Americas in the sixteenth century, and both landed in Indian cooking so completely that the results now feel indigenous. They pair well because they are opposites in every way that matters in a pan: tomato is acidic, watery and full of flavour; potato is neutral, dry and full of starch.

The starch is what turns the two into a sauce. As potato simmers in tomato it sheds starch into the liquid, which thickens the whole dish without any flour or cream. A well-made aloo matar or pav bhaji has body that comes entirely from the potato itself, which is also why mashing a few pieces against the side of the pan is a standard trick for thickening at the end.

There is one important piece of technique. Acid stabilises the pectin holding plant cells together, so potatoes cooked in a tomato-heavy liquid soften much more slowly than potatoes cooked in plain water. Add the tomato too early and you can simmer for a long time and still get pieces with a chalky centre. The reliable order is to fry the aromatics, cook the potato until it is beginning to soften, and only then add the tomato to finish.

Lomo saltado shows a different approach entirely: potato is fried separately as chips and folded in at the last second so it stays crisp against the wet, soy-and-vinegar-spiked tomato. Custrd matches your potatoes and tomatoes against tested recipes and shows what else each one needs.