Not all fruits and vegetables fit neatly into filter categories. Tomatillos for example are in Misc. vegetables. If you ever aren't sure which filter an ingredient fits in, enter the ingredient name in the search box (in speech marks if more than one word) then follow the numbers in the filters. The number represents the number of recipes that contain that ingredient and the highest number will be the ingredient you selected since EVERY recipe in the search results contains that ingredient. All the other filter numbers are the other ingredients in those same recipes. So for tomatillos the highest numbers go Vegetables / Other vegetables / Other. Not very helpful for this search so as debkellie suggests, just searching by tomatillos in the word search should get you the results you want.