Mustard & Mortar is an independent, reader-focused editorial publication dedicated to explaining Bengali cooking through ingredients, preparation, texture, and adaptable regional methods. It presents household variation as a natural part of the cuisine, rather than promoting a single definitive version of each dish. Its approach encourages cooks to observe, taste, and troubleshoot as they work.

The site organizes its material into Pantry & Prep and Pots & Plates. Pantry & Prep offers ingredient and preparation guides covering spices, pastes, rice, fish, vegetables, and practical choices that affect a Bengali-style dish. Examples include a pantry starter list, guidance on cooking rice into separate grains, preparing fish for curry, and grating fresh coconut. Pots & Plates focuses on technique-first instruction for dals, jhols, fries, mixed vegetables, steamed dishes, breads, fish curries, rice dishes, and chutneys. Its articles address topics such as achieving creamy aloo posto, tempering dal without burning spices, and troubleshooting fish curry. Mustard & Mortar states that its recommendations are editorial, with no sponsored placements or paid reviews.