u/legbonesarebroken

Hi! I live in the midwest and have never been to In n Out but will be in Utah this weekend and am planning to try. What do I need to get?

I dislike ketchup, love mustard, LOVE pickles & onions, like tomatoes and lettuce (especially on burgers) also am a big fan of pepperoncinis and I think am interested in trying the chopped chilis.

Thinking I am going to do a whole grilled onion wrapped flying dutchman (found this on TikTok) but also want to try other things. I am interested in mustard-fried but can I do that for my flying dutchman?

What would experts say a first-timer should get, given the above preferences?