Preheat your oven to 450 F.
Melt the cooking fat and toss with the pumpkin or butternut squash cubes with some salt and pepper.
2 tablespoon cooking fat, 5 cups pumpkin or butternut squash
Place on a baking sheet and roast for about 15 minutes. Turn the cubes over and roast for another 15 minutes, until soft.
Let stand the pumpkin or squash at room temperature to cool.
Whisk the orange juice, walnut or macadamia oil and lemon juice in a bowl, add the walnuts and arugula and stir to coat with the vinaigrette. Season again with salt and pepper.
2 tablespoon orange juice, 1 ½ tablespoon walnut or macadamia oil, 1 ½ teaspoon lemon juice, ½ cup chopped walnuts, About 8 cups lightly packed aragula
Add the roasted pumpkin and berries and toss gently.
½ cup blueberries or raspberries