焼く
やく · yaku · JLPT N4 · verb-godan
to grill
🔥🍞 焼 = fire 火 + 尭; yaku as in yakitori and teriyaki
The left side of 焼 is the fire radical 火, so the verb means cooking with direct heat: grilling, baking, toasting. You already know its stem: yaki in yakitori (grilled chicken), teriyaki and yakisoba is the noun form of yaku.