My father always cooks more polenta than he needs for a meal. The excess he spreads on an oiled surface and chills. Next day, he cuts out chunks, fries them in olive oil and serves with salad.
When it comes to cooking pasta, the first essential is to make sure you have a big enough pot: it needs room to roll in the water while cooking.
Buckwheat, like Marmite and durian, is a seriously divisive foodstuff, so it needs a seriously capable defence team if it's ever going to make it on to most people's dinner tables.