1.Process coriander, parmesan, cashews and garlic until finely chopped. Add 2/3 cup oil; process until smooth.
2.Cut each chicken breast in half horizontally. Heat extra oil in a large frying pan over moderate heat. Cook chicken for 3 minutes each side or until cooked.
3.Transfer to a heatproof plate. Brush with sambal oelek. Cover with foil; rest for 5 minutes. Slice.
4.Add onion and tomato to pan. Cook and stir for 2-3 minutes or until onion softens. Remove from heat.
5.Cook noodles in a large saucepan of boiling salted water, stirring occasionally, for 3 minutes or until tender. Drain; return to pan.
6.Add chicken, coriander pesto, tomato mixture, spinach leaves and lemon juice. Season with salt. Toss to combine. Spoon into shallow serving bowls. Serve at once.