What you'll need:

1 Tbsp oil3 medium yellow onions, thinly sliced into half moons¼ cup Maggi sauce, plus 1 Tbsp1 garlic clove, finely chopped2 Tbsp mayonnaise1 Tbsp butter, melted1 tsp soy sauce1 tsp Worcestershire sauceJuice of ½ lime1 snapper or bass (2 to 3 lb), split open, spine removed

How to make it:

For serving: warm corn tortillas,* thinly sliced red onions, thinly sliced cucumbers, hot sauce

1. In a large skillet on medium, heat the oil. Add the onions and cook, stir­ring often, until they begin to wilt and shrink, about 5 minutes. Add the ¼ cup Maggi sauce and cook, continuing to stir fre­quently, until the onions are melty and sweet, 20 to 30 minutes.

2. In a large bowl, stir the garlic, mayo, butter, soy sauce, 1 Tbsp Maggi sauce, Worcestershire, and lime juice. Check the taste and add more of any of these, if needed.

3. Preheat your grill to medium, direct heat. Open up the fish, season it with salt and pepper, and then use a spoon to apply a layer of the sauce to the flesh side, slathering it generously. Now clamp the fish into a grill basket and start it skin side down. Flip the fish every 3 to 5 minutes until both sides are well browned and mottled with a few darker spots, about 15 minutes.

4. Bring the fish to your kitchen, unclamp it, and set it on a platter. Arrange some rings of red onion and cucumber disks around it and serve with hot tortillas, the Maggi onions, and a bottle of your favorite hot sauce. Your guests can take it from here.

*Cold tortillas taste terrible and tend to disintegrate when you fill them. Heat them over direct heat on the grill until puffy and mottled. Then swaddle them in a clean kitchen towel to help them steam.