Bottom four-dot fire radical - Kangxi #86 in its bottom-of-character form, a contracted
火. The four dots are stylized flames licking up at whatever sits above. The indexing radical here. Anchors
煎 in the cooking-with-heat family alongside
煮 (boil),
炒 (stir-fry),
蒸 (steam - different radical),
烫 (scald). The image of a pan over flames captures the stir-fry/pan-fry meaning exactly.