he ate me out but

Before I say anything I just wanna say , I clean my vagina with water only, I keep my hygiene good down there , but when my boyfriend fingered me his fingers smelled of onions... and he said it tasted like it too I don’t know why I don’t even like to eat onions so it can’t be a you ate what you eat situation so what can I do for it to smell and taste better because that’s embarrassing!!!