Lamb Merguez Burgers with Harissa Mayonnaise

I've been big on ground meats lately because they're fairly easy to work with one-handed. This is a perfect quick, easy, and flavourful weeknight dinner. Don't pass on the mayonnaise! I served these without a bun, but you can put it in a bun or pita bread with cucumber, tomatoes, and salad greens. I went ahead and fried these up, but grilling and broiling are also good.

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Lamb Merguez Burgers with Harissa Mayonnaise (from Cook This Now)

Ingredients
1/2 tsp coriander seed
1/2 tsp fennel seed
450g ground lamb
1/4 cup finely chopped onion
2 tbsp butter, cut into small pieces
2 garlic cloves, finely chopped
1 1/2 tsp kosher salt
1 tsp paprika
pinch cayenne
olive oil, for brushing if grilling
1/3 cup mayonnaise
1 1/2 tsp harissa

1. In a dry skillet over medium heat, toast coriander and fennel until fragrant. Grind until fine.
2. In a large bowl, mix together ground spices, lamb, onion, butter, garlic, salt, paprika, and cayenne. Form into 4 patties.
3. In small bowl, whisk together mayonnaise and harissa.
4. Grill, broil, or fry burgers to desired doneness. Serve with mayonnaise.