I have rheumatoid arthritis so limited dexterity in my hands and no cheffy knife skills. I'm also left-handed if that makes a difference. I cannot chop an onion without bits going all over the work surface and floor, the knife skidding every which way despite being kept sharpened and bits of skin (both mine and the onion's) ending up in the pot. After 30 years of cooking I admit defeat - how do you do it?