Peel the onions and trim the ends.
Slice them into thick rings or halves, depending on preference.
2. Season the Onions
In a bowl, toss the onions with olive oil and Cajun seasoning until evenly coated.
3. Boil the Onions
Place the seasoned onions in a large pot.
Add 1 cup of water to the pot.
Cover and bring to a gentle boil over medium heat.
4. Simmer Until Tender
Reduce heat to low and simmer for 20–25 minutes, stirring occasionally.
Onions should be soft, slightly caramelized, and infused with the seasoning.
5. Serve
