Mustard seeds have a very pungent smell. We rarely use them when cooking and I'll even omit it if I see it in a recipe or look for a different one. Keep the windows open; turn on exhaust fan, use fragrance plug-ins (I like the ones from Bath and Body Works). You can try making a solution of water, white vinegar, baking soda, and several drops of an essential oil and putting it in a spray bottle and spraying the home. I don't know how much using incense will help as sometimes that can be too strong. Maybe eat out at times? Or bring desi food from outside when possible.