唐辛子
とうがらし capsicum (Capsicum annuum, esp. the cultivated chili peppers); chili pepper (chile, chilli)
Why it means this
唐 ('Chinese', i.e. foreign/imported) + 辛子 (hot mustard) — the 'imported hot spice'; the chili pepper.
Breakdown
Each character links to its full entry — origin story, stroke order, and readings.