Whisk together red wine vinegar, garlic, chives, brown sugar, curry powder, and soy sauce in small bowl. Slowly whisk in the olive oil in a steady stream.
Toast slivered almonds in 350˚ oven for approximately 10 minutes, nuts should be a light golden color. Set aside to cool.
Tear lettuce, and spinach leaves as needed, into bite size pieces in large salad bowl. Top with grapes, mandarin oranges, onion, avocado, and toasted almonds.
Toss with dressing and serve immediately.