To make the hummus put the roasted pumpkin, chickpeas, cumin, lemon, tahini, garlic, salt and 1/4 cup of olive oil into the bowl of a food processor and blitz. If the mixture is too thick to puree add a little more oil and water alternately.
Taste the mixture. It should have enough salt to bring out the flavours of the pumpkin and cumin and the lemon needs to add some zing.
Put the Tuna steaks in to a bowl with the cumin, paprika, olive oil and salt and chilli if using. Coat the Tuna in the spices.
Sear the Tuna in a hot skillet with a little olive oil till done to your liking. This will take about 6-8 minutes. Turn the Tuna when it is starting to turn opaque around the edges. Flip, cook on this side for several minutes till just done. The inside should stll be pink.
Serve this with pepita seeds, hommus , pumpkin pieces, toasted flatbread and salad