No, pepper is not a stem vegetable.
Peppers, botanically speaking, are fruits. A fruit is defined as the mature ovary of a flowering plant, containing seeds. Peppers develop from the flower of the pepper plant and contain seeds within, thus classifying them as fruits.
Stem vegetables are edible plant stems. Examples of stem vegetables include:
- Asparagus
- Celery
- Kohlrabi
Because peppers develop from the flower and contain seeds, they are classified as fruits, not stem vegetables.