Start by mixing all the dry ingredients - flour, salt, dry fenugreek leaves, coriander seeds, carom seeds, black pepper, baking powder, and baking soda.
Now, add oil and rub it all together, using both hands, till the mixture resembles bread crumbs.
Add water and knead it into a semi-soft dough. Do not overwork the dough.
Take small portions of the dough, round them roughly into small balls, and flatten them.
Heat oil for deep frying. On medium heat, fry the mathris till they are light brown.
Now, take them out and allow them to cool before storing them in an airtight container.