Grain bowls are the meal-prep format that refuses to get boring: a hearty grain, a protein-rich pulse, roasted or raw vegetables, and a sauce that ties it together. The economics get even better when the grains and pulses come from bulk bins. This guide to Bulk Barn meal prep grains covers which ones to buy, how the unit-price math works, and four batch recipes that turn a single Sunday cook into a week of lunches. Bulk Barn’s model is simple — you pay for exactly what you scoop, nothing more. For meal-preppers, that means three advantages: you can trial a new grain with a $2 scoop instead of committing to…