Squeeze the orange juice into a bowl and whisk in the almonds, vinegar, parsley, honey, mustard and salt and pepper to taste. Slowly whisk in the olive oil until emulsified. Let sit at room temperature for at least 15 minutes before serving.
03Brush the trout fillets with canola oil and sprinkle with salt and pepper on both sides. Grill until golden brown and slightly charred on both sides and just cooked through, about 3 minutes per side. Remove to the platter with the radicchio and immediately drizzle with the vinaigrette. Garnish with parsley leaves.