Step 1

Make the couscous: In a medium, heat-resistant bowl, combine boiling water, couscous and 1 teaspoon salt, and cover with a plate or lid. Let sit until the water is absorbed, 7 to 12 minutes. Fluff with a fork and set aside.

Step 2

Meanwhile, light the grill to medium-high or heat your broiler with the rack 3 inches from the heat source.

Step 3

Halve lemons crosswise and then squeeze the juice from one half into a large bowl. Add cumin, remaining 1/2 teaspoon salt and a few grinds of pepper. Slowly whisk in 1/3 cup olive oil. Stir in radishes and set aside to marinate.

Step 4

Place onion wedges and remaining 3 lemon halves, cut-side down, in a grill basket and grill until charred on one side only, 2 to 4 minutes. Or place on a sheet pan and broil until charred, 5 minutes. Transfer onions and lemons to a cutting board.

Step 5

Either on the grill, or on the same sheet pan as you used for the onions, grill or broil merguez until browned all over, 2 to 4 minutes per side. Transfer sausages to a cutting board and cover with foil to keep warm while you assemble the salad.

Step 6

When onion is cool enough to handle, dice it and add to radishes. Fold in couscous, tomatoes, 1/2 cup mint, 1/2 cup parsley, cucumbers, nuts and a large pinch of salt. Squeeze the juice from a charred lemon half into the bowl. Taste and add more salt and lemon, if needed. Slice merguez on a bias into 1/2-inch pieces.

Step 7

To serve, spoon couscous salad onto a platter, then top with sausages and any accumulated juices. Garnish with remaining herbs and a big drizzle of olive oil, and serve with remaining charred lemon halves on the side for more squeezing.