Blush wine vinaigrette, homemade (recipe follows) or store bought
To make the candied walnuts: In a large skillet, melt the butter over medium heat. Add the walnuts, sugar, cinnamon, and salt and cook, stirring constantly, until the sugar melts and caramelizes, about 2 minutes. Transfer to a silicone mat-lined baking sheet and let cool completely, 20 minutes.
To make the vinaigrette: In a jar with a lid, add the sugar, vinegar, hot water, mixed berry jam, and garlic powder. Add the oil and salt. Cover and shake vigorously to combine.
To make the salad: In a large bowl, toss together the mixed greens and 1/2 cup of the strawberries. Add the vinaigrette to taste and toss until the greens are coated. Top with the remaining strawberries and sprinkle the feta cheese and candied walnuts on top.