drag and drop in correct order

My suggestion:

1. Add a STATE to each of your correct items called INVISIBLE (except for ONION, skip that one).  After you create this state, delete the image from the state so the state exists, but has nothing in it.   Then set INVISIBLE as the beginning state for all your food except onion.
2. Now paste a new copy of the same food images back over the originals in the exact same spots.  Name each one of these new ones as tomatoBAD, LettuceBAD, etc.
3. Add each of these BAD images to your Form View list of DRAG ITEMS, but do not assign them a Drop Target.
4. Under Drag & Drop Options, set the "Return item to start point if dropped outside: a correct drop target"
5. Last step is to set two triggers on each of the CORRECT items, starting with Onion.
   • Change state of TOMATO to Normal when Onion is dropped on top loaf
   • Change state of TomatoBAD to HIDDEN when Onion is dropped on top loaf.
6. I also added a SUBMIT trigger when the bottom loaf is dropped on the top loaf so the interaction completes automatically.

See what we've done?  The only droppable item that is visible initially is the onion.  All the others are fakes ones that are always wrong and will snap back if you try to use them.  Once you drop the onion, you reveal the next real one and hide it's corresponding BAD version that was on top of it.  Visually no one can see that happen, but it works!

BTW, if you apply triggers of any kind to the BAD images,  they become droppable on the bread even though they have no target assigned, so I can't think of a way to count missteps and give a hint without losing the "snap back wrong answers" effect.   Now that the interaction works the way you want, it should be OK, no one can get this question wrong.

I never would have thought to do this, thank you so much for your help Jerry! I was thinking I would need to create variables in order to get this to function properly and that's what I was getting stuck on. Thanks again!

Glad it helped.   In our company we have many questions that are more in the line of "lead them to the correct answer" instead of "Did they get it right?"

Is there an updated manner to do this as opposed to created so many triggers and states? 

I figured on form view there would just be a setting that indicates proper order. 

I once saw a student created video about hand washing that they put in their SL project. If you need to d an evaluation, you could pause the video, and ask the learner to click on the next correct item. Then after feedback, the video would continue.