In a small container with a tight-fitting lid, combine the vinegar, oil, honey, salt, pepper and spring onion, (& orange juice, orange rind if using). Close the lid and shake vigorously to blend.
Place the cos lettuce into a large serving bowl. Drizzle over vinaigrette and toss to coat. Add orange slices (& dried cranberries if using) and toss gently. Garnish with toasted almonds. Serve immediately.