Place beef and flour in a large bowl. Season and toss to
combine. Heat half the oil in a medium saucepan over
medium-high heat. Cook the beef, in batches, for 3 mins or
until beef browns. Transfer to a heatproof bowl.
Return beef to pan with the paprika and stir to coat. Add
pasta sauce and 2 cups (500ml) water and stir to combine.
Increase heat to high and bring to the boil. Reduce heat to
low. Simmer, stirring occasionally, for 1 hour or until beef
is tender and sauce thickens.
Meanwhile, heat half remaining oil in a large saucepan
over medium-high heat. Add half the mushroom and cook for 2
mins or until tender. Transfer to a plate. Repeat with
remaining oil and mushroom. Cover to keep warm.
Add potato to pan and cover with water. Bring to the boil
over high heat. Cook for 10 mins or until tender. Drain.
Return to pan. Place over medium-high heat and cook for 1 min.
Remove from heat. Add butter and use a fork to mash until
smooth. Stir in milk and mustard.
Add mushroom and half the sour cream to beef mixture. Stir
to combine. Season. Divide mash and beef mixture among bowls.
Top with remaining sour cream. Sprinkle with extra
paprika.