There are some communities that feel garlic or regular onions are too strong, and substitute the white of leeks. It does affect the resulting taste, but if your wife tolerates them, it’s an option.

My own suggestions for recipes would include some classic Slavic dishes where onions aren’t essential. These do exist, 😁 particularly ones that mix sweet, sour and savoury flavours. e.g., Crepes/nalasnyky filled with farmers’ cheese and butter or cream, traditionally served with sour cherry or strawberry preserves on top, are a favourite. For a savoury version, try these nalasnyky with dill in the cheese filling.