There are people who eat food, cook food and write about food. There are people who take photographs of food and display them on blogs. And scattered among them all are people whose passion has led them to a specific corner of the culinary world, enthusiasts who have set out to learn as much as possible about the food that turns them on. It isn't enough to bake bread. It's about getting to the bottom of what makes spectacular bread, getting to the soul of the flour, water and salt. We spoke with five people who delve into pantry staples, who obsess over the intricacies of what to others might seem so basic.