View filtering, Relationship Vs Contextual filter
You should use the contextual filter to identify the article the block is being displayed on.  E.g. content id from URL should work.

Then you should use the relationship option to link the field_product_teaser info to products.  E.g. Content referenced from field .... 

Then in the view, you can select the product fields you want to display and use the reference to tell views what you want displayed. E.g. title w/ product reference relationship = product title.