Grilled merguez sandwiches with caramelized onions, manchego, and harissa mayonnaise

Grilled merguez on a toasted baguette with sweet caramelized onion, sharp Manchego cheese, fresh cilantro, and spicy harissa mayo makes for one insanely awesome sandwich.
Source: www.seriouseats.com
Ingredients
- ⅓ cup mayonnaise
- 1 tbsp harissa
- 8 links merguez
- 1 French baguette
- ⅓ cup extra-virgin olive oil
- ½ cup caramelized onions
- ⅓ lb manchego cheese, grated
- 1 bunch fresh cilantro
Cevapi (southeastern european meat and onion sausages)
Chacarero chileno (chilean steak and bean sandwiches)
Pan bagnat (Provençal tuna sandwich)
Saffron chicken kababs with peaches