Sweet Potato And Yam Chips With Hot Mustard Dipping Sauce

Name: Sweet Potato And Yam Chips With Hot Mustard Dipping Sauce
Ingredients: vegetable oil, for deep-frying; 1 (300g) small sweet potato (kumara), peeled and thinly sliced lengthways; 1 (300g) small white sweet potato, peeled and thinly sliced lengthways; 2 (300g) small purple yams, peeled and thinly sliced lengthways; sea salt flakes; ½ cup (120g) sour cream; 2 teaspoons hot English mustard; 1 tablespoon lemon juice