Pull thread seam from peas and discard.
Blanch snap peas in boiling, salted water for 3 minutes. Add snow peas and cook 1 minute longer. Drain and refresh in cold water. Set aside.
In saucepan, saute onion in butter on medium for 1 minute. Add almonds and cook until butter foams slightly.
Add peas. Toss well to coat. Season with freshly ground pepper.