Bake cake in 9" by 13" rectangular pan, cool and freeze for several hours.
Google images of t-bone steak, observe details, now remove frozen cake and use a sharp knife to cut the outline of the cake into a steak shape
Split cake lengthwise and apply the raspberry jelly as if making a sandwich. Put the top layer of cake on top of the jellied layer.
Apply a thin coating of vanilla frosting to top and sides of the steak cake. Roll out the white fondant, saving a small piece of the fondant to make the T-bone into. Once the fondant is rolled out to 1/8 of an inch carefully lift it and set it on top of the cake, making sure the sides are covered. press onto the cake gently and form a rim around the cake so that it looks like fat around the edge. push down into the T-bone crevice without breaking the fondant. Let fondant dry for 15 minutes.
Next, mix burgundy and brown food gel coloring and stipple lightly onto top of the fondant. Let first layer dry before applying more layers, 2 or 3. I did not use alcohol mixed with gel and it worked out great and made a shiny appearance like real steak on the grill would look.
The cooked fat on the sides was done with yellow gel food coloring and then I brushed on straight brown food color gel with a dry paint brush, mixing the two colors.
Add the t-bone shaped fondant and push down into the crevice and flatten out the top so it looks like cut bone. Finish it by taking a metal skewer and wiping brown gel food coloring with finger onto the skewer, placing it gently at an angle to look like cake was on a grill, repeat for each grill mark. Plating it on a cake board covered in foil with fondant beans and real mashed potatoes completes the look.