Rembrandt offers a recipe creation view, where you can drag and drop ingredients to create a recipe.
All known resource types, transformers and algorithms are displayed on the left and clicking on one of them creates the building block in the recipe area in the middle.
Connecting blocks can be done by dragging one close to the others input or output ports, but will only work, if the respective types fit. For example the resource type Car will not connect to a port that expects the Driver resource type.