The word "焙烤" is formed by combining the characters "焙" and "烤", both of which individually refer to cooking methods involving dry heat. "焙" means to bake or roast over a slow fire, and "烤" means to bake, roast, or toast. Together, they create a compound word where each character contributes its similar meaning, emphasizing the action of baking or roasting through their synonymous reinforcement.