For the slaw, use a mandoline if you have one and cut the red and green cabbage as thin as you can cut it. Peel and julienne the carrots. (I use a julienne tool). Slice the red and green onions. Toss the cabbages, carrots and onions together. Pour on just enough dressing to lightly coat the slaw and toss to combine well. Add the pumpkin and sesame seeds and top with a squeeze of lemon juice.