Step 1

Add orange juice, lemon juice, oil, sugar and salt to a mason jar, shaking vigorously until combined.

Step 2

In a large bowl, add mandarin oranges, avocado and red onion. Stir in the orange juice mixture gently (you don't want to mush up the avocados). Cover and let chill 30 minutes while the flavors blend.

Step 3

Add lettuce to the chilled orange mixture and toss slightly.