This beautiful salad is a great way to highlight citrus, using the flesh, along with the zest and juice. Creamy tahini, pleasantly bitter radicchio, crunchy cashews and refreshing mint round out the dish.
For the cashew-sesame crunch: Heat the olive oil in a medium heavy-bottomed skillet over medium heat until shimmering, 1 to 2 minutes. Add the cashews, stirring continuously, until lightly golden, 1 to 2 minutes. Add the sesame seeds and crushed red pepper. Cook, stirring continuously, until the nuts are golden and the mixture is fragrant, 1 to 2 minutes.
Remove from the heat and stir in the maple syrup. Season with kosher salt. Set aside to cool.
Meanwhile, make the salad: Combine the tahini with the orange zest and lemon zest in a medium bowl. Add half of the orange juice and half of the lemon juice. Slowly whisk in 1/4 cup water until the sauce is smooth and fluffy. Season with kosher salt. Set aside.
Cut the ends off the 3 remaining oranges. Stand each orange on one end and cut away the peel and white pith, following the contour of the fruit with a very sharp paring knife. Work from top to bottom, rotating the orange as you go. Slice the oranges into 1/4-inch-thick rounds and discard any seeds. Set aside.
Thinly slice the radicchio with a mandoline or sharp knife and transfer to another medium bowl. Add the olive oil and the remaining lemon juice and orange juice and toss until combined.
Spread the tahini sauce on a serving platter to fully cover the surface. Arrange the orange slices on top and sprinkle with sea salt. Mound the radicchio on top in a generous pile and sprinkle with sea salt. Scatter the mint leaves and cashew-sesame crunch over the top.